Arize Phoenix

Langfuse is an open-source observability platform for LLM applications, supporting tracing, evaluation, prompt versioning, and cost analytics.

TruLens is an open-source tool for evaluating and tracking LLM apps. It provides specialized evaluation for RAG applications including context relevance, groundedness, and answer relevance.

AgentOps is an observability platform for AI agents, providing monitoring, debugging, and evaluation to help developers optimize agent performance.

DeepEval is an open-source evaluation framework for LLM applications. It provides rich evaluation metrics and tools, supporting unit testing and integration testing to help developers build reliable LLM applications.