mlflow

The open source AI engineering platform for agents, LLMs, and ML models. MLflow enables teams of all sizes to debug, evaluate, monitor, and optimize production-quality AI applications while controlling costs and managing access to models and data. Maintained by mlflow on GitHub, where it has earned 27,013 stars from the community.

It's actively developed around agentops, agents, ai, and is a solid reference for anyone building with these tools.