Free open source alternative app list of LLM Evaluation & Observability :

LangWatch

Key features Simulation-based testing for AI agents and LLM applications. Evaluation tools for LLM applications. Observability for AI agents and LLM applications. Open-source platform licensed under Apache-2.0. Self-hostable via Docker. Platforms: Linux, macOS, Windows Links Official website: langwatch.ai Source code: github.com/langwatch/langwatch Pricing: Free and open-source under Apache-2.0, with self-hosting via Docker.

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