Best AI Tools for Coding & Development (2026)

The shared Agent Skills format used by Claude Code, OpenAI Codex, and Gemini CLI. Write skills once, use across all major AI coding tools.

Tabby — Self-Hosted AI Coding Assistant

Self-hosted AI code completion and chat assistant. Privacy-first alternative to GitHub Copilot. Supports 20+ models, repo-aware context, and IDE integrations. 33K+ stars.

OpenAI Codex CLI — Official Coding Agent

OpenAI official coding agent CLI. Supports Agent Skills, custom prompts, and IDE integration. Open-source alternative to Cursor.

Turn any workflow into reusable AI agent skills that install on Claude Code, Copilot, Cursor, Windsurf, Codex, Gemini CLI, Kiro, and 7 more tools. No coding required. MIT, 660+ stars.

Embed live code editors in web apps with instant preview. Sandpack by CodeSandbox powers interactive coding experiences for AI chatbots, docs, and educational platforms.

Claude Code Prompts — 26 Agent Prompt Templates

Independently authored collection of 26 prompt templates for AI coding agents — system prompts, tool routing, agent delegation, memory management, and multi-agent coordination patterns. MIT license.

Cursor Tips — Advanced AI Coding Workflow Guide

Comprehensive guide to advanced Cursor workflows. Covers Composer, multi-file edits, .cursorrules, codebase indexing, and prompt engineering for 10x AI coding productivity.

Automates the full AI development lifecycle from task planning to merged PR. Orchestrates AI agents through planning, execution, code review, and merge. 800+ GitHub stars.

Gemini CLI Extension: Code Review — Quality Checks

Gemini CLI extension for automated code review. Analyzes code quality, suggests improvements, and checks coding standards.

Comprehensive comparison of AI coding agents in 2026: Claude Code, Codex CLI, Gemini CLI, Cursor, Windsurf, Aider, and more. Features, pricing, model support, and use case recommendations.

OpenAI Codex & Cookbook — Official Collection

Official OpenAI resources: Codex CLI coding agent and the OpenAI Cookbook with prompting guides for GPT, Codex, and Realtime API.

Sweep — AI Junior Developer for GitHub

AI-powered GitHub bot that turns issues into pull requests. Sweep reads your codebase, plans changes, writes code, and handles review feedback automatically.

Claude Token Efficient — Drop-in CLAUDE.md for Terse Output

A single CLAUDE.md file that reduces Claude Code output verbosity by 63%. Includes 5 specialized profiles for coding, benchmarks, agents, and analysis workflows.

OpenSpec provides structured specifications that AI coding agents follow to produce consistent code. 36K+ stars. Works with Cursor, Claude Code, Copilot. MIT.

Open-source AI developer agent by Block (Square). Goose automates coding tasks with extensible toolkits, session memory, and MCP server support in your terminal.

IBM's open-source code LLMs from 3B to 34B parameters. Trained on 116 programming languages with Apache 2.0 license. Top performer on code benchmarks.

Directory and management platform for MCP servers. Discover, install, and monitor Model Context Protocol servers for Claude Code, Cline, and other AI coding tools.

OpenAI Codex CLI — Terminal Coding Agent by OpenAI

Official OpenAI terminal coding agent. Reads your codebase, writes code, runs commands, and manages files from the command line. Multi-model support with sandbox execution. 20,000+ stars.

Roo Code — AI Coding Team Inside VS Code

Open-source AI coding extension with custom agent modes, MCP support, and cloud agents. Fork of Cline with 22K+ stars.

Roo Code — AI Coding Agent with Custom Modes

Fork of Cline with custom agent modes, boomerang orchestration, and multi-model routing. Create specialized AI agents for coding, review, and architecture tasks.

Serena is a coding agent MCP server with semantic code retrieval and editing. 22K+ stars. Understands classes, functions, symbols for precise context-aware edits. MIT.

AI Project Starter Kit — CLAUDE.md + MCP + Skills

Ready-to-use starter kit for AI-powered projects. Pre-configured CLAUDE.md, essential MCP servers, recommended skills, and project structure templates. Clone and start coding with Claude Code in 2 minutes.

Cline — Autonomous AI Coding Agent for VS Code

Autonomous coding agent in VS Code. Creates/edits files, runs commands, browses the web, and uses MCP tools — with human approval at every step. 60K+ stars.

Open-source AI coding agent with 140K+ stars. TUI-first design, LSP integration, works with Claude, OpenAI, Google, or local models. Two built-in agents: build and plan. MIT license.

Open-source agentic development environment (YC W26) that runs multiple AI coding agents in parallel, each in isolated git worktrees. Supports Claude Code, Codex, Gemini CLI, and 20+ agents. 3,600+ stars.

Figma Context MCP — Design-to-Code for AI Agents

MCP server that gives AI coding agents access to Figma design context. Provides layout, styles, and component info so agents like Cursor and Claude Code can generate pixel-perfect code. 14K+ stars.

Claude Code CLAUDE.md — Best Practices Template

Production-tested CLAUDE.md template for Claude Code projects. Covers coding conventions, test requirements, git workflow, and project-specific AI instructions.

Cursor vs Claude Code vs Codex — AI Coding Compared

In-depth comparison of the three leading AI coding tools in 2026. Covers pricing, context window, MCP support, agent capabilities, and best use cases for each platform.

Comprehensive comparison of all AI coding agents in 2026. Covers Claude Code, Cursor, Codex, Gemini CLI, Cline, Roo Code, Windsurf, and Aider with feature matrices and recommendations.

Convert any GitHub repository into a single text file optimized for LLM consumption. Paste a URL, get clean context for Claude Code, ChatGPT, or any AI coding tool.