Haystack
Deepset open-source NLP framework for production LLM pipelines
Verdict
Excellent for enterprise document QA. Clean pipeline abstraction that is testable and type-safe. Haystack 2.0 rewrite is well-designed with great component model.
Other Frameworks & SDKs
- DSPyStable
Stanford framework for programming (not prompting) LMs
- GuidanceExperimental
Microsoft's constrained generation library for structured LLM output
- InstructorProduction
Structured outputs from LLMs using Pydantic schemas
- LMQLExperimental
Query language for LLMs — SQL-like syntax for constrained generation
- LangChainProduction
Composable LLM application framework — chains, agents, RAG
- LlamaIndexProduction
Data framework for LLM applications — indexing and retrieval