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Langsmith-sdk: Client SDK for LLM Debugging, Evaluation, and Monitoring
The Langsmith-sdk provides client SDKs for interacting with the LangSmith platform, enabling robust debugging, evaluation, and monitoring of language models and intelligent agents. It offers native integrations with both LangChain Python and LangChain JS, making it an essential tool for LLM application development.
Helicone: Open Source LLM Observability Platform and AI Gateway
Helicone is an open-source LLM observability platform and AI Gateway for AI engineers. It provides one-line code integration to monitor, evaluate, and experiment with large language models, offering features like cost tracking, prompt management, and intelligent routing. The platform supports a wide range of inference providers and frameworks, simplifying LLM development and deployment.

Opik: Open-Source LLM Observability, Evaluation, and Optimization
Opik is an open-source platform by Comet designed to streamline the lifecycle of LLM applications. It provides comprehensive tools for debugging, evaluating, and monitoring RAG systems and agentic workflows. Developers can leverage its tracing, automated evaluations, and production-ready dashboards to build and optimize generative AI applications.