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A collection of online utilities for developers

A curated collection of free services for developers

A community for sharing programming questions and answers

AI-powered programming assistance and code generation

Conversational AI for document analysis and coding questions

Google's conversational AI with Google service integration

An AI-powered code editor

Community-driven roadmaps for developer growth

An AI programming assistant developed by GitHub

An AI-powered code editor supporting code generation and editing

A development environment for managing multiple coding agents' tasks and code changes in an IDE

Anthropic's coding tool. Requires a paid Claude plan or an account with API billing; not included in the free claude.ai plan

Vercel's AI-powered UI component generation tool

An AI builder for generating and editing web app code through prompts

A no-code builder for quickly creating web applications with AI

An AI builder for creating apps, agents, and automations through prompts in a single workspace

An AI-powered browser development environment for coding, running, and deploying in one place

An AI pair programming tool for the terminal

An open-source AI coding assistant for VS Code & JetBrains

An AI plugin for VS Code supporting code generation and improvement

An AI-powered code completion tool

AWS's AI development assistant. IDE plugin support is scheduled to end on 2027-04-30; check the official support notice

An AI-powered tool for code quality and test automation

A natural-language-based web and mobile testing tool. Uses permitted under FSL-1.1-ALv2 incur no software fees, but external model, browser, and device service costs are separate

An AI image generation and design tool

Figma's AI-powered design tool

A tool for generating UI designs from text input

An AI tool for converting designs into frontend code

OpenAI's conversational AI supporting tasks ranging from programming to general questions

Anthropic's conversational AI supporting document analysis, question answering, and code review

Google's conversational AI with Google service integration

xAI's conversational AI supporting real-time web search and reasoning

A conversational AI service using DeepSeek models

A search engine combining real-time information retrieval with AI answers

Google's AI-powered research and note-taking tool

Mistral AI's conversational AI platform

Quora's platform for accessing various AI models in one place

A free web tool for comparing three AI answers to a study question without model names, then revealing the models after voting

OpenAI API documentation explaining how to integrate GPT models into applications

Claude API documentation explaining how to integrate Claude AI into applications

A development environment for experimenting with the Gemini API and quickly building prototypes

An LLM inference API platform

An inference platform for running open-source AI models in the cloud

A platform for running AI models via APIs

A hub for AI models and datasets, with inference APIs and a community

Provides LLMs and APIs. Check the license for each model

An API for calling DeepSeek models from applications

Enterprise LLM APIs and embedding models

A third-party-operated OpenAI-compatible API gateway. Check key types and data handling policies separately before use

A REST API and remote MCP server that lets AI agents place actual phone calls to US businesses for reservations, inquiries, and quotes, and receive call results and transcripts. Requires an account (API key or MCP OAuth login), supports US numbers only, and stores call recordings and transcripts on the provider's servers

A framework for developing LLM applications

A tool for building graph-based AI agent workflows

A RAG framework connecting LLMs with data

A multi-agent collaboration framework

Microsoft's multi-agent conversation framework

A source-available workflow automation tool. Offers self-hosting with usage restrictions under the Sustainable Use License and a paid Cloud service; distinct from OSI open source

An SDK for quickly integrating AI features into web apps, including Next.js apps

A tool for easily running various open-source AI models locally

A desktop application for testing and running large language models on a local computer

A conversational AI app supporting local model execution. Offline use requires preparing models and checking settings

A self-hostable open-source solution providing a local REST API compatible with the OpenAI API

An open-source conversational AI ecosystem that runs locally, with a focus on privacy

A privacy-focused AI solution for interacting with documents locally

A tool for orchestrating coding agents from the command line and managing per-task branches, worktrees, and a merge queue

An MIT-licensed open-source CLI for running a team of AI coding agents on your own Linux server. Each agent runs an official agent CLI, such as Claude Code or Codex, as a systemd service under a separate Linux user, exchanging work through a shared task queue

A CLI for recording HTTP calls between coding agents and model providers and replaying saved runs

A terminal UI for managing installed coding agent CLIs as tmux sessions. Supports session status, optional Git worktrees, and diff review

A desktop app for installing, running, and supervising DeepSeek Harness. Running the app locally is not the same as running models locally or offline; check model provider costs separately

A desktop app for running AI coding agents through visual workflows. Agents work from tickets, errors, and schedules and request confirmation before making changes. Works with Claude Code, Codex, OpenCode, GitHub Copilot, and Cursor. MIT-licensed, runs locally on macOS and Linux. Model provider costs are separate

An open-source (AGPL-3.0) tool that implements and tests GitHub Issues labeled ai-ready in isolated workspaces, creates PRs, and merges them after review in a separate AI session (free self-hosting; paid Orbi Cloud)

MDN Web Docs provides information on Open Web technologies, including HTML, CSS, and APIs, for both websites and progressive web apps

The Modern JavaScript Tutorial includes explanations, examples, and exercises on topics such as closures, the Document Object Model, events, and object-oriented programming

Mastering DOM manipulation with vanilla JavaScript

A fast Rust-based web bundler

Thymeleaf is a modern server-side Java template engine for both web and standalone environments

Logic-less templates

Guidance for building modern web experiences that work across all browsers

A powerful, extensible, feature-rich frontend toolkit

A game for learning CSS Flexbox

A styling tool that defines styles in JavaScript and generates CSS at build time

A CSS framework for building UIs by combining utility classes in HTML

A library for building UI elements such as buttons and forms with components and themes for Tailwind CSS

A Tailwind CSS-based UI component library

A collection of unstyled UI components designed with accessibility in mind

A modern UI library with accessible, flexibly customizable components based on Tailwind CSS

A React UI framework for web and app design

A UI component development tool for building components systematically and efficiently, also used for documenting UI component libraries and as a platform for developing design systems

Official Kotlin documentation

Official Java documentation

Official Python 3 documentation

Official documentation for the runtime that runs JavaScript outside the browser, including on servers

Current official React documentation in Korean

Official Next.js documentation

Official Vuejs guide

Official Spring Boot documentation

Official Spring documentation

Official introductory documentation for the stable version of Django

Spring tutorial examples

Official documentation for the stable version of Flask

Official ExpressJS website

Official Ruby On Rails guide

Official NestJS documentation

Official FastAPI documentation

Official documentation for learning GraphQL queries, schemas, and API design

Community-translated documentation. Use as a reference while checking for differences from the current official documentation

Official AWS documentation

Official Azure documentation

Official GCP documentation

Naver Cloud Platform user guide

Official Android guide

Official iOS developer website

Official React Native documentation

Current official documentation for installing, learning, and developing with Flutter

Official Oracle website

Official MySQL documentation

Official MongoDB documentation

Official PostgreSQL documentation

Official Redis documentation

Official Elasticsearch documentation

Official Algolia documentation

Entry point for official Ubuntu Server documentation

Official Fedora documentation

Official Debian documentation

Official openSUSE documentation

Official Manjaro Linux documentation

Official Rocky Linux documentation

Read-only archive of older documentation. Refer to it separately from current CentOS Stream guidance.

Official Kubernetes documentation

Official Docker documentation

Official Argo CD documentation

Official Vagrant documentation

Official Slack API documentation

Official Discord API documentation

Official GitHub REST API documentation

Official Google Cloud API documentation

Official Git documentation

Official GitHub App API documentation

Official GitHub GraphQL API documentation

Official GitHub webhook documentation

Official Google Developers documentation

Documentation covering a range of information on refactoring and design patterns

Documentation covering design, rendering, and performance patterns

A portal for public information produced by South Korean public institutions

A blogging service for developers

A social network for IT service makers

A community for sharing development questions and experiences

The Korean Ubuntu community (separate from official product documentation)

Korean user forum for CodeIgniter, a PHP framework

A forum for JavaScript developers

Laravel Korea community

An inclusive Korean developer community where members give back by sharing knowledge

A community for sharing development content and asking and answering questions

A network of topic-specific Q&A communities

Hashnode is a free developer blogging platform that lets you publish articles on your own domain and connect with a global developer community.

A community for exploring product introductions and user feedback

A forum for programming questions and discussions

A community for sharing programming questions and answers. Include reproducible code and error details when asking questions.

A platform for publishing and subscribing to newsletters and articles

A learning platform offering practical courses in development, data, and other fields, with Q&A boards for individual courses

Online programming courses centered on web development projects

Explore a variety of learning content to strengthen your software programming skills

Project-based coding courses that teach you to recreate web services

Take courses designed for developers at NEXTSTEP

A worldwide community of people learning to code together and a free online learning platform offering a variety of development curricula

A development mentoring program

Programming, web development, and DevOps news, with tutorials and tools for beginners through experts

IT product and industry news and analysis

Korean and international IT industry news

Helps development teams adopt new technologies and practices

TechCrunch. Reporting on technology, startups, venture capital funding, and Silicon Valley business

Regularly finds and categorizes technical information from blogs and social media, adding value before sharing it

Practical development experiences and technical content

A news site for people interested in development news, technology updates, startup information and know-how, and interesting things around the world. Subscribe via email newsletter, Twitter, or a Slack bot.

A platform for sharing introductory programming learning content, including Saenghwal Coding

Tutorials on web technologies and syntax examples for various languages, with hands-on browser exercises

A programming education platform offering hands-on browser exercises and learning paths

An online course marketplace covering development and various other fields

An online course platform for development and data from the NAVER Connect Foundation

A tutorial for learning basic Java syntax through examples

Learning materials on web development fundamentals, including HTML, CSS, and JavaScript

A site for learning programming through projects that reimplement real software, such as Redis and DNS servers

A site that makes learning Git easier with visualizations, tutorials, and games organized by level

An IT book reading service provided by Gilbut Publishing Co., Ltd.

Korean university open courses

Open courses from Harvard University

A free learning site for studying Linux, Git, Vim, and tmux through hands-on exercises in a simulated browser terminal (a free account is required after the first lesson)

A level-based site for practicing Vim/Neovim and tmux shortcuts by matching a target state with keystrokes. Runs in the browser without installation or an account, and stores progress only in the browser's localStorage.

A site for solving programming problems and having solutions judged online

Codeforces: programming contests and competitions, and a programming community

A platform for solving algorithm problems and practicing for coding tests

Hone your coding skills by solving programming problems

A practice platform for solving algorithm problems and preparing for technical interviews

A guide to learning algorithmic problem solving, providing difficulty and tier information for Baekjoon Online Judge problems

A collection of tech blogs

Channel Talk Tech Blog

Woowa Brothers Tech Blog

Kakao Tech Blog

Kakao Pay Tech Blog

Coupang Tech Blog

WATCHA Team Blog

Toss Tech Blog

Kurly Tech Blog

Banksalad Tech Blog

Olive Young Tech Blog

NHN Cloud Meetup

Hyperconnect Tech Blog

Danggeun Market Tech Blog

Gangnam Unni Tech Blog

Yogiyo Tech Blog

Platfarm Tech Blog

Spoqa Tech Blog

LINE Tech Blog

SOCAR Tech Blog

RIDI Tech Blog

Pet Friends Tech Blog

NAVER Tech Blog

AWS Korea Blog

Rapport Labs Tech Blog

Meta Engineering Blog

Amazon Alexa Blog

Apple Developer Blog

Netflix Tech Blog

Google Developer Blog

LinkedIn Engineering Blog

Slack Engineering Blog

Airbnb Tech Blog

Zoom Developer Blog

Riot Games Tech Blog

Pinterest Engineering Blog

PayPal Tech Blog

eBay Tech Blog

X (formerly Twitter) Engineering Blog

Google Play Engineering Blog

Dropbox Tech Blog

Spotify Engineering Blog

Github Engineering Blog

Grab Engineering Blog

jojoldu's development notes. A blog for readers looking to learn from the problem scenarios and solutions documented in individual posts.

John Grib's wiki and blog. A resource for readers exploring topic-based notes and linked reference materials.

A blog for readers exploring Jaegeujigeu's accounts of development experiences

A public archive collecting development learning notes, a wiki, and reviews

A Brunch blog for exploring articles on software development and ways of working

A collection of Kent Beck's articles. Subscription-based content for readers seeking the original English texts.

A blog for readers exploring Evan Moon's development notes

OKdevTV's collection of videos from Korean development-related YouTubers

Step-by-step explanations starting with the basics, making development accessible even if you know nothing about programming

Online and offline activities that teach programming to the general public

Videos from Woowa Brothers' engineering organization

Michael Sipser's computer science lectures offered by MIT

A collection of software development resources

Korean translations of the Spring Boot documentation

Google's experimental lab

A collection of programming resources

A collection of Node.js resources (Awesome series)

A collection of Vue.js resources (Awesome series)

A collection of Svelte resources (Awesome series)

A collection of Angular resources (Awesome series)

A collection of Next.js resources (Awesome series)

A collection of Ruby resources (Awesome series)

A collection of C++ resources (Awesome series)

A collection of .NET resources (Awesome series)

A collection of .NET Core resources (Awesome series)

A collection of CSS resources (Awesome series)

A collection of Bootstrap resources (Awesome series)

A collection of Tailwind CSS resources (Awesome series)

A collection of font resources (Awesome series)

A collection of icon resources (Awesome series)

A collection of web icon resources (Awesome series)

A collection of MCP server resources (Awesome series)

A collection of open source maintainers (Awesome series)

A collection of algorithm visualization resources (Awesome series)

A collection of free computer science courses (Awesome series)

A collection of Docker resources (Awesome series)

A collection of data science resources (Awesome series)

A collection of data science learning resources (Awesome series)

A collection of computer science resources (Awesome series)

A collection of computer vision resources (Awesome series)

A collection of functional programming resources (Awesome series)

A collection of JVM resources (Awesome series)

A collection of empirical software engineering resources (Awesome series)

A collection of generative AI resources (Awesome series)

A collection of interview question resources (Awesome series)

A collection of CodeRabbit resources (Awesome series)

A collection of Playwright resources (Awesome series)

A collection of deep learning resources (Awesome series)

A collection of Geo JSON resources (Awesome series)

A collection of microservices resources (Awesome series)

Roy Fielding's REST API paper

Context Engineering for Large Language Models

say828's book <Spring Cloud and Service Mesh Crash Course>

<The Site Reliability Workbook> by Betsy Beyer + 4 people

<Site Reliability Engineering> by Betsy Beyer + 3 people

<Building Secure & Reliable Systems> by Betsy Beyer + 6 people

A deployment platform for frontend and full-stack apps

A backend platform providing databases, authentication, and storage

A cloud platform for deploying applications and databases

A cloud platform for deploying web services, databases, scheduled jobs, and more

An API for integrating payments into applications

An authentication and user management service

A managed Postgres and Vitess/MySQL database platform

Serverless data services. See the official page for supported products and usage-based pricing

An API for sending email from applications

Provides backend infrastructure and MCP integration for coding agents. Check account requirements and service-specific costs before use

A screenshot API that converts URLs, HTML, and Markdown to PNG, JPEG, WebP, and PDF. Requires an API key; the free plan includes 100 images per month. The online tools on the homepage can be used without an account

A static hosting API that publishes an HTML file or static site folder to a fixed HTTPS address (name.deed.page) with a single PUT request. Also usable from coding agents through a remote MCP server. The first publish requires no account or API key; use the token returned in the response to update the same address. The free plan allows 25 sites with 25 MB per site. Server-side code and databases are not supported

A collection of browser tools for file, image, text, and data conversion, and more

A collection of browser tools for processing images, video, audio, PDFs, and text. The source code is available under the MIT license

A collection of free tools for processing image, PDF, audio, and video files in the browser. Files are not uploaded, no account is required, and the source code is available under the MIT license

Developer utilities for regex testing, JSON formatting, and more. Some tools involve server-side processing, so check whether files are uploaded

A search engine

A privacy-focused search engine

A Korean search engine (Naver)

A Korean search engine (Daum)

IP address lookup

Free Korean domain registration

A browser-based internet speed test provided by Netflix

A collection of emoji for Git commits

A Git platform

A Git platform (similar to GitHub)

Git repository hosting operated by Atlassian

A tool for searching code across all public GitHub repositories

A tool that visualizes files in a Git repository as a diagram

A collection of LGTM GIFs for Git commits

Bubble, a no-code tool

Flutterflow, a no-code tool

Wave on, a no-code tool

Webflow, a no-code tool

Softr, a no-code tool

Adalo, a no-code tool

Glide, a no-code tool

An API debugging tool

An API documentation tool

An open source CLI that generates interactive documentation, typed SDKs, and MCP servers from API specifications and Markdown

A CSS/JSON/HTML formatting tool

A JSON formatting tool

Online regex learning and testing

An online regex tool

A UI/UX design and prototyping tool

A diagramming tool

A free design tool

A diagramming tool

A collection of free high-resolution images

An emoji repository

An easy-to-use diagramming tool

A Photoshop-like image editing tool

Vector images for PowerPoint presentations

An easy-to-use background removal tool

A color recommendation tool

A color recommendation tool

A tool for exploring shades of similar colors

A microservices architecture diagramming tool

A tool that exports all iOS, Android (adaptive), and web app icon sizes from a single image as a ZIP file. Includes a reference library of at least 18,000 real app icons (icon export is free; some features are paid)

A Spring project generator

A Ktor project generator

Official documentation for the Kotlin code formatter and linter

A formatter that automatically standardizes code style across multiple languages

A JavaScript linter

A unified toolchain for the web

The current JUnit guide for writing and running Java and JVM tests

An integrated development environment developed by Jetbrains (Java, Kotlin)

An integrated development environment developed by Jetbrains (C, C++)

An integrated development environment developed by Jetbrains (SQL)

An integrated development environment developed by Jetbrains (JavaScript)

JetBrains' Python IDE. See the official page for data science and analytics features and plan-specific terms of use

An integrated development environment developed by Jetbrains (Ruby)

An integrated development environment developed by Jetbrains (C#, .NET)

An integrated development environment developed by Jetbrains (documentation)

An integrated development environment developed by Jetbrains (Rust)

An integrated development environment developed by Jetbrains (Go)

An integrated development environment developed by Jetbrains (testing)

An Android development IDE distributed by Google and based on the IntelliJ platform

A text editor developed by Microsoft

An integrated development environment developed by Microsoft

A fast, lightweight integrated development environment

A cross-platform text editor

A Windows-only text editor

A Java-based integrated development environment

A hosted Jupyter notebook service. Available computing resources and limits vary by plan and availability

An integrated development environment developed by Apple

An online compiler and debugger

A read-only viewer for macOS 14 and later for reading local Markdown files such as READMEs, documentation, and plans written by coding agents. Supports Finder Quick Look, Mermaid diagrams, code syntax highlighting, automatic refresh when files change, and PDF export. No editing features; a one-time purchase of $19.99

A text-to-speech tool for creating voice UI prototypes or audio material for testing. Check the usage terms for each voice

A developer utility for checking URL encoding and decoding

A website with cryptography, conversion, and parsing features useful for development

A browser-based hex editor

A site that issues free SSL/TLS certificates

A collection of around 2,300 free browser tools for developers. Offers JSON and XML formatters, encoders, validators, CSS and color generators, converters, and calculators. Most run locally in the browser and require no account

A single MIT-licensed Bash script that benchmarks a Linux server's CPU and memory (sysbench) and disk 4K random read/write IOPS (fio) in about one minute. Asks for confirmation before installing sysbench and fio, sends no results externally unless an upload token is specified, and removes packages installed by the script with the --cleanup option