Every pick below was checked on its official site. Pricing changes, so confirm the current plan before you rely on it.

Gemini CLIOpen source

AI tools for coding

Google’s open-source AI agent that brings Gemini into your terminal.
AiderOpen source

AI tools for coding

AI pair programming in your terminal.
ClineOpen source

AI tools for coding

Open-source coding agent with Plan/Act modes and MCP support.
OpenCodeOpen source

AI tools for coding

The open-source AI coding agent, with free models included.