Updated · April 2026
Pi
Minimalist and extensible terminal harness for AI coding agents with 38K stars. Created by Mario Zechner. Architecture 'do-it-yourself' - you can ask Pi to write its own extensions in TypeScript. Used under the hood by OpenClaw. Niche but respected in the community for its hackable design.
Terminal Agent
Open source
macOS, Linux, Windows (terminal)
Key features
Minimalist terminal harnessSelf-extendingTypeScript skills38K starsOpen sourceUsed by OpenClaw
Best for
Most hackable - minimal terminal harness; ask Pi to extend itself with TypeScript skills, then ship the new behavior
Plans
Free
BYO API key - extensible harness - write your own skills
$0
Most hackable
Minimal terminal harness; ask Pi to extend itself with TypeScript skills, then ship the new behavior. 38K stars.
Data sourced from official sites and developer communities. Features and pricing may vary - check official sites for the latest.