ElBruno.LocalLLMs

Current verdict: worth watching and trying if you specifically need local LLM support in C#, but the evidence is still limited. The strongest source here is the official GitHub repo itself, which clearly positions the project as a C# local LLM chat completions library using ONNX Runtime and compatible with Microsoft.Extensions.AI. That supports what it is, but not yet whether it is broadly production-proven.

In practice, this appears to help .NET developers add local chat-completion capability into their own apps, rather than providing a consumer chat app or a hosted model service. A better analogy is a local inference integration layer for the Microsoft.Extensions.AI ecosystem, not an all-in-one AI platform and not a standalone runtime in the same sense as Ollama. The repo supports a capability-level understanding, but not strong conclusions on model coverage, performance, or operational maturity.

On cost and adoption friction, the supported facts are that it is open source and built around ONNX Runtime. That usually implies you bring your own .NET environment, hardware, and model files.