Semantic Kernel
Microsoft's enterprise SDK for AI apps (.NET, Python, Java)
Verdict
Production-ready for .NET and Azure shops. Native Azure service connectors with managed identity. Python and Java SDKs maturing fast. Best choice for C#-first teams.
Other Frameworks & SDKs
- DSPyStable
Stanford framework for programming (not prompting) LMs
- GuidanceExperimental
Microsoft's constrained generation library for structured LLM output
- HaystackStable
Deepset open-source NLP framework for production LLM pipelines
- 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