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1. LangChain LangChain Public

   C# implementation of LangChain. We try to be as close to the original as possible in terms of abstractions, but are open to new entities.

   C# 1k 140

2. AutoSDK AutoSDK Public

   Automated .NET SDKs for your APIs

   C# 82 8

3. OpenAI OpenAI Public

   C# SDK based on official OpenAI OpenAPI specification

   C# 32 7

4. Anthropic Anthropic Public

   C# SDK for the Anthropic API -- Claude chat completions, tool calling, and vision

   C# 41 7

5. Ollama Ollama Public

   Ollama SDK for .NET

   C# 199 17

6. Tiktoken Tiktoken Public

   High-performance .NET BPE tokenizer — up to 618 MiB/s, competitive with Rust. Zero-allocation counting, multilingual cache, o200k/cl100k/r50k/p50k encodings + HuggingFace tokenizer.json support.

   C# 86 7