Playground GitHub Repositories (2026) · Open Source Tools

Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards.

Layer5, expect more from your infrastructure

Observal is self-hosted registry for your coding agent extensions with a built in insight engine. Setup Observal, define the scope and share your Skills, MCPs and Agents with your peers.

Better Go Playground with autocompletion and syntax highlight

SwiftFiddle is an online playground for creating, sharing and embedding Swift fiddles (little Swift programs that run directly in your browser).

Frontend of Source Academy, an online experiential environment for computational thinking (React, Redux, Saga, Blueprint)

Quickly develop, deploy and test Solana programs from browsers

Next-generation AI Agent Optimization Platform: Cozeloop addresses challenges in AI agent development by providing full-lifecycle management capabilities from development, debugging, and evaluation to monitoring.