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Top 23 C# API Projects
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The public keys and ~/.ssh/config are committed as plain files, the private halves are rendered from Bitwarden at apply time and never touch git. The same mechanism fills in per-machine values — my .chezmoi.toml.tmpl pulls a few cloud subscription IDs from a Bitwarden item so the helper scripts in ~/.local/bin know which subscription to talk to without those IDs living in a public repo.
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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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Project mention: The Pirate Bay Remains Resilient, 20 Years After the Raid | news.ycombinator.com | 2026-06-01
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Hot Chocolate
Welcome to the home of the Hot Chocolate GraphQL server for .NET, the Strawberry Shake GraphQL client for .NET and Nitro the awesome Monaco based GraphQL IDE.
Project mention: GraphQL vs REST: 18 Claims Fact-Checked with Primary Sources (2026) | dev.to | 2026-04-17Apollo Federation pioneered this pattern, and today multiple vendors provide production-ready Federation routers: Apollo Router (Rust), WunderGraph Cosmo Router (Go, open-source Apache 2.0), The Guild's Hive Gateway (TypeScript), ChilliCream's Hot Chocolate (C#/.NET), and AWS AppSync (managed service). Competition between vendors means teams have choices without being locked into a single provider.
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Project mention: docfx-remote-include: inline remote markdown into DocFX, and govern the assembled page | dev.to | 2026-06-09
docfx-remote-include is a Markdig extension and a dotnet CLI tool for DocFX. It does two things: it inlines markdown fetched from an HTTP service at build time, and it can send each fully-assembled page to a transform service for centralized governance.
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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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ASP.NET MVC Boilerplate
.NET project templates with batteries included, providing the minimum amount of code required to get you going faster.
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data-api-builder
Data API builder provides modern REST, GraphQL endpoints and MCP tools to your Azure Databases and on-prem stores.
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FFImageLoading - Fast & Furious Image Loading
Image loading, caching & transforming library for Xamarin and Windows
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bank-api
The Bank API is a design reference project suitable to bootstrap development for a compliant and modern API.
Project mention: Show HN: Implementing OAuth Authorization Code Flow in OpenAPI Based MCP Servers | news.ycombinator.com | 2025-12-29 -
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JsonApiDotNetCore
A framework for building JSON:API compliant REST APIs using ASP.NET and Entity Framework Core.
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SaaSHub
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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# API discussion
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storage_size.js Module in WebForms Core
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A note from our sponsor - SaaSHub
www.saashub.com | 13 Oct 2026
Index
What are some of the best open-source API projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Bitwarden | 20,272 |
| 2 | Jackett | 16,176 |
| 3 | GraphQL for .NET | 5,986 |
| 4 | Hot Chocolate | 5,758 |
| 5 | tModLoader | 5,718 |
| 6 | ServiceStack | 5,497 |
| 7 | DocFX | 4,446 |
| 8 | kiota | 3,828 |
| 9 | Telegram.Bot | 3,647 |
| 10 | ASP.NET MVC Boilerplate | 3,483 |
| 11 | ApiEndpoints | 3,196 |
| 12 | simulator | 2,458 |
| 13 | data-api-builder | 1,525 |
| 14 | RevitLookup | 1,436 |
| 15 | FFImageLoading - Fast & Furious Image Loading | 1,404 |
| 16 | DSharpPlus | 1,329 |
| 17 | Log4Net | 933 |
| 18 | bank-api | 844 |
| 19 | WebAPI Contrib | 767 |
| 20 | JsonApiDotNetCore | 715 |
| 21 | Twilio-csharp | 714 |
| 22 | mtapi | 699 |
| 23 | WatsonTcp | 675 |
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