Open Source Developer Tools
Discover 445 open source Developer Tools repositories from GitHub, each with an analysis of what it does, key features, use cases and alternatives. Developer Tools projects here are most often combined with Python, AI Agents and CLI. Last updated October 4, 2026.
445 repositories · updated October 4, 2026
claude-code-codex-bridge: Sync Claude Code Setup to Codex
A Python CLI that turns local Claude Code plugins, skills, agents, commands, MCP servers, and instructions into Codex equivalents. Useful for developers who maintain both tools and want Claude Code to remain the source of truth.
tmux-agent-sidebar: Monitor Coding Agents Across tmux
tmux-agent-sidebar brings Claude Code, Codex, and OpenCode activity from every tmux session and window into one sidebar. It helps developers track agent status, inspect work, and manage worktrees without switching panes.
codex-mcp-server: Connect Claude Code to Codex CLI
This TypeScript MCP server lets Claude Code call OpenAI Codex CLI for code analysis, generation, and review. It suits developers who want to use Codex alongside Claude in an MCP-compatible editor.
agent-bridge: Connect Claude Code and Codex for Collaboration
AgentBridge relays messages between Claude Code and Codex in a shared local workflow, enabling in-session reviews and task handoffs. It is designed for developers who already use both tools and want them to coordinate without manual copy-paste.
ios-simulator-skill: Build and Test iOS Apps with Claude Code
A Claude Code plugin that wraps Xcode builds and iOS Simulator interaction in focused scripts. It suits developers using AI agents to build, test, and navigate iOS apps while keeping tool output concise.
awesome-agent-skills: Find Skills for AI Coding Agents
A curated index of agent skills from official developer teams and the community, for use with tools such as Claude Code, Codex, Gemini CLI, and Cursor. Browse by provider and task to find reusable guidance for development workflows.
micstec-skills: Browse and Install AI Agent Skills
A managed collection of skills, plugins, extensions, rules, and MCP server resources for popular AI coding agents. Use it to browse materials across platforms and copy selected items into an agent's configuration.
awesome-agent-skills: Find Tools for AI Coding Agents
A cross-platform directory of skills, plugins, rules, and tools for AI coding agents. Use it to compare resources across ecosystems such as Agent Skills, MCP, Cursor, Windsurf, Gemini CLI, and Copilot.
skills: Give AI Agents Google Product Guidance
Google Skills is a collection of task-focused instructions for AI agents working with Google products and technologies, especially Google Cloud. Install selected skills through the Skills CLI or use the bundled plugins with supported agent harnesses.
agent-skills: Structure AI-Assisted Development from Specs to PRs
A collection of reusable skills for AI coding agents, covering specification writing, implementation, review, testing, and autonomous sprint workflows. Useful for teams that want repeatable processes and clearer quality gates across agent sessions.
agent-sandbox: Run Coding Agents in a Locked-Down Environment
Agent Sandbox runs AI coding agents in Docker containers with restricted workspace access and default-deny network controls. It suits developers who want to limit an agent’s access to local files, network services, and credentials while retaining CLI or IDE workflows.
Agent-Memory: Persistent Memory for AI Coding Agents
Agent-Memory gives coding agents persistent, searchable memory across sessions and tools. It is aimed at developers using MCP-compatible agents who want automatic context capture and recall without repeatedly explaining their projects.