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DSPy

Stanford NLP and the DSPy community · Prompting, evaluation & observability

Python framework for programming language-model pipelines with typed signatures and modules, then optimizing prompts and weights automatically against a metric

MITOpen sourceFreeLocalSelf-hostedNov 2, 2026

LangSmith

LangChain, Inc. · Prompting, evaluation & observability

LangChain's hosted platform for tracing, evaluating and deploying LLM applications and agents, with prompt tooling, an LLM gateway and cloud, hybrid or self-hosted options

ProprietaryFreemiumPaidSelf-hostedNov 2, 2026

LiteLLM

BerriAI · Prompting, evaluation & observability

In-depth entry

Open-source Python SDK and self-hosted AI gateway that calls 100+ LLM providers in the OpenAI format, with routing, fallbacks, virtual keys, budgets, spend tracking and logging callbacks

MITOpen sourceFreeLocalSelf-hostedNov 2, 2026

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