Roo Code is a free, open-source VS Code extension (Apache 2.0 license) that transforms your code editor into a full AI-powered development team. It supports any LLM provider including Claude, GPT, Gemini, Mistral, Grok, and local models via Ollama, giving developers complete control over model selection and costs. The extension features a Custom Mode system with five built-in modes (Code, Architect, Ask, Debug, and Test) plus a community-driven Mode Gallery where users can share and download specialized configurations for workflows like backend scaffolding, CI/CD pipeline editing, and test generation. Roo Code can execute terminal commands, run test suites, and open browsers for integration testing, all with configurable approval settings. Beyond the free VS Code extension, Roo Code Cloud offers team-oriented agent capabilities including PR reviews, remote task control (Roomote Control), and integrations with GitHub, Slack, and Linear. The platform is SOC 2 Type 2 compliant and has accumulated over 22,000 GitHub stars and 1.4 million VS Code Marketplace downloads. With its model-agnostic architecture and deep customization options, Roo Code has emerged as a leading open-source alternative to proprietary AI coding tools like Cursor and GitHub Copilot.