Open source playground projects
Every project in the registry tagged playground, ranked by real GitHub adoption.
Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready d
A blazing fast & offline frontend code editor
A cross-platform C# editor and playground.
Frequently asked questions
How many open source playground projects are there?
This registry tracks 3 projects tagged playground, with 28,113 GitHub stars between them. The most-adopted is opik at 23,122 stars.
Are these playground projects free to use?
Yes — 3 of the 3 carry an explicit open-source licence across 2 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which playground project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these playground projects still maintained?
3 of the 3 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.