Agent frameworks
Open source
Langfuse
Langfuse is open-source tracing, prompt management, evals, and cost tracking, and you can self-host it for free.
- tracing
- evals
Freemiumlangfuse.com
Evals and observability
Tracing and evaluation for agent runs, including Langfuse, Braintrust, and Arize.
LangSmith tracing, evals, deployment, and an LLM gateway are part of the LangChain platform. Those stay on the LangChain and LangGraph listings.
3 tools · How to build a business agent system
Agent frameworks
Braintrust
Braintrust is a tracing and evaluation platform with scorers, human review, and a Loop agent.
- evals
- tracing
Freemiumbraintrust.devAgent frameworks
Open sourceArize AX / Phoenix
Arize AX does agent tracing and evals with OpenTelemetry, and Phoenix is the open-source local-first product.
- tracing
- evals
Freemiumarize.com