free coding open source Engineers
Cline
by Cline
An open-source autonomous coding agent for VS Code that works with any model and your own API keys.
4/5
Pros
- + Fully open source and model-agnostic
- + Bring your own API key — no markup
- + Plan/Act modes for controlled execution
- + Reads files, runs commands, uses MCP servers
Cons
- − You pay raw model API costs, which can be high
- − Requires comfort with API keys and config
- − No managed cloud workspace
What Is Cline
Cline is an open-source AI coding agent that runs as a VS Code extension. Unlike closed agents, it works with any model — Claude, GPT, Gemini, or local LLMs — using your own API keys.
How It Works
Cline operates in two modes: Plan, where it proposes an approach, and Act, where it edits files, runs terminal commands, and uses MCP servers to extend its tools. Every action is shown for approval, keeping the developer in control.
Who It’s For
Cline suits engineers who want an agentic workflow without vendor lock-in or per-seat pricing, and who are comfortable managing API keys and absorbing raw model costs.