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Top 23 C# AI Projects
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OfficeCLI
OfficeCLI is the first and best Office suite purpose-built for AI agents to read, edit, and automate Word, Excel, and PowerPoint files. Free, open-source, single binary, no Office installation required.
Project mention: Notable this week: Kimi K3 weights land, MCP goes stateless, OfficeCLI for agents | dev.to | 2026-08-02OfficeCLI shipped in July with 10,800+ GitHub stars and an Apache 2.0 license. It's a single-binary C# tool — embedded .NET runtime, no Microsoft Office required — that gives AI agents read, write, and render access to .docx, .xlsx, and .pptx files from the command line.
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ReSharper
ReSharper is now available in VS Code and Cursor. ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.
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Projects that involve AI integration increasingly shape everyday development. One such project is Semantic Kernel. It's an SDK for building AI agents and orchestrating LLM scenarios, and Microsoft actively develops it.
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unity-mcp
Unity MCP acts as a bridge between AI assistants and your Unity Editor. Give your LLM tools to manage assets, control scenes, edit scripts, and automate tasks within Unity.
Project mention: Unity MCP: Bridging AI Assistants with Unity for Automated Game Development | dev.to | 2026-07-05The protocol facilitates communication between various MCP clients (e.g., Claude Desktop & Code, Cursor, VS Code, Gemini CLI) and the Unity Editor. Installation is achieved via Unity's Package Manager, by adding the GitHub URL https://github.com/CoplayDev/unity-mcp.git?path=/MCPForUnity#main or through OpenUPM. The system requires Unity 2021.3 LTS or newer and Python 3.10+ (managed via uv).
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Everywhere
On-screen aware AI assistant for your desktop. Uses current app context, multiple LLMs, and MCP tools to help you act across apps.
Project mention: 10 Powerful Open Source AI Tools You Won’t Believe Are Still Free in 2026 | dev.to | 2025-11-03Supported Platforms: Windows, macOS, Linux GitHub Repository: https://github.com/DearVa/Everywhere
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StableSwarmUI
StableSwarmUI, A Modular Stable Diffusion Web-User-Interface, with an emphasis on making powertools easily accessible, high performance, and extensibility.
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SwarmUI
SwarmUI (formerly StableSwarmUI), A Modular Stable Diffusion Web-User-Interface, with an emphasis on making powertools easily accessible, high performance, and extensibility.
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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Unity-MCP
AI Skills, MCP Tools, and CLI for Unity Engine. Full AI develop and test loop. Use cli for quick setup. Efficient token usage, advanced tools. Any C# method may be turned into a tool by a single line. Works with Claude Code, Gemini, Copilot, Cursor and any other absolutely for free. (by IvanMurzak)
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Generative-AI-for-beginners-dotnet
Five lessons, learn how to really apply AI to your .NET Applications
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We will build a .NET CLI tool using OllamaSharp. It scans each project, sends relevant files to the local AI model, and generates a single catalog-info.yaml file containing all services, ready for Backstage to consume.
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I created Hyperlambda (https://hyperlambda.dev), so I spend a lot of time thinking about accidental complexity and implementation surface area. One thing leaks like this keep reminding me is that a surprising amount of software risk comes from packaging and delivery details rather than the main logic people spend all their time reviewing.
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fluid-behavior-tree
Behavior trees for Unity3D projects. Written with a code driven approach on the builder pattern.
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LangChain
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. (by tryAGI)
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DotRecast
DotRecast - a C# port of Recast & Detour, Industry-standard navigation mesh toolset for .NET, Unity3D, games, servers
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mcp-gateway
MCP Gateway is a reverse proxy and management layer for MCP servers, enabling scalable, session-aware stateful routing and lifecycle management of MCP servers in Kubernetes environments. (by microsoft)
Project mention: Every AI toolchain is inventing its own safety layer. We shipped one that works across all of them. | dev.to | 2026-05-12Anthropic shipped Claude Code hooks — PreToolUse, PostToolUse, Notification, and friends. They run as subprocesses, get JSON on stdin, and decide whether the tool call proceeds. OpenAI ships tool guardrails in the Agents SDK — Python (and now TS) callables you attach to a tool, with tripwire booleans that abort the run. The MCP ecosystem is sprouting gateways and proxies for the same purpose: MCPX, IBM ContextForge, Microsoft's MCP Gateway, Lasso Security's MCP Gateway — all reasonable answers to the same wire-level question.
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Catalyst
🚀 Catalyst is a C# Natural Language Processing library built for speed. Inspired by spaCy's design, it brings pre-trained models, out-of-the box support for training word and document embeddings, and flexible entity recognition models. (by curiosity-ai)
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Retrieval favors pages that are crawlable, fast, and unambiguous about what they answer. Synthesis favors passages that state a fact plainly and attribute it. Attribution favors pages whose structure a machine can read — which is what the schema.org vocabulary is for (schema.org). Model providers keep documenting tool and agent interfaces that consume that structure directly (modelcontextprotocol.io, openai.com, anthropic.com); Anthropic and OpenAI both publish guidance that rewards clean, well-marked content over prose that buries the answer in paragraph six.
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For .NET developers specifically, exploring the LlmTornado repository provides practical examples of agent implementations that work across 25+ AI providers. The key advantage: write once, switch providers as needed.
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chats
A powerful and flexible frontend & AI gateway for large language models, supporting 21+ mainstream AI model providers. (by sdcb)
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C# AI discussion
C# AI related posts
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I Don't Like LLMs
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OpenSubs alternatives - subtitleedit, buzz, and vibe
4 projects | 17 Sep 2026 -
Notable this week: Kimi K3 weights land, MCP goes stateless, OfficeCLI for agents
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GPT-Live Needs an Interruption UI, Not Just a Microphone Button
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Docx-CLI: agents read/edit Word docs using 1/2 the wall-clock time and tokens
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Unity MCP: Bridging AI Assistants with Unity for Automated Game Development
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Hyperlight Sandbox + MCP CodeMode: Secure Agent Execution Beyond Containers
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A note from our sponsor - ReSharper
www.jetbrains.com | 15 Oct 2026
Index
What are some of the best open-source AI projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | OfficeCLI | 31,784 |
| 2 | semantic-kernel | 28,636 |
| 3 | unity-mcp | 14,832 |
| 4 | StabilityMatrix | 8,890 |
| 5 | Everywhere | 6,306 |
| 6 | StableSwarmUI | 4,948 |
| 7 | SwarmUI | 4,636 |
| 8 | Unity-MCP | 4,458 |
| 9 | Generative-AI-for-beginners-dotnet | 3,111 |
| 10 | Emgu CV | 2,300 |
| 11 | LLMUnity | 1,719 |
| 12 | OllamaSharp | 1,408 |
| 13 | magic | 1,200 |
| 14 | fluid-behavior-tree | 1,183 |
| 15 | ReGoap | 1,120 |
| 16 | LangChain | 1,077 |
| 17 | cellm | 953 |
| 18 | DotRecast | 951 |
| 19 | mcp-gateway | 870 |
| 20 | Catalyst | 860 |
| 21 | OpenAI-DotNet | 757 |
| 22 | LLMTornado | 644 |
| 23 | chats | 614 |
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