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Top 23 C# API Projects
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Project mention: NodeWarden: Bitwarden on Cloudflare Workers — No Server Required | dev.to | 2026-04-07
Bitwarden Official Website
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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: Building a Markdig Extension for DocFX: Remote Content Inclusion with AI Rewriting | dev.to | 2026-05-22
DocFX — Microsoft's open-source documentation generator — is excellent at building static documentation from local markdown files. But it doesn't natively support fetching and inlining content from remote sources at build time.
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SaaSHub
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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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RevitLookup
Interactive Revit RFA and RVT project database exploration tool to view and navigate BIM element parameters, properties and relationships.
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Project mention: log4net VS Serilog - a user suggested alternative | libhunt.com/r/log4net | 2025-06-09
Redirect the obsolete to the official: https://www.libhunt.com/r/logging-log4net
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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
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# API discussion
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Building a Markdig Extension for DocFX: Remote Content Inclusion with AI Rewriting
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Dashlane Review 2026: Best Password Manager for Developers?
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Using the Segment Feature
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ViewData in CodeBehind: Data Transfer Across MVC Components
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Why You Can’t Write to the Response in ASP.NET Core (And How to Fix It)
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Loading a View Inside Another View in CodeBehind (SSR vs CSR)
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Everything Automated: No Client Routing, No Manual Mapping, No Frontend State Management, No Build Pipeline, No Separate UI API
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A note from our sponsor - SaaSHub
www.saashub.com | 6 Jun 2026
Index
What are some of the best open-source API projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Bitwarden | 19,095 |
| 2 | Jackett | 15,510 |
| 3 | GraphQL for .NET | 5,985 |
| 4 | Hot Chocolate | 5,703 |
| 5 | ServiceStack | 5,498 |
| 6 | tModLoader | 5,365 |
| 7 | DocFX | 4,429 |
| 8 | kiota | 3,759 |
| 9 | Telegram.Bot | 3,628 |
| 10 | ASP.NET MVC Boilerplate | 3,481 |
| 11 | ApiEndpoints | 3,200 |
| 12 | simulator | 2,438 |
| 13 | data-api-builder | 1,425 |
| 14 | FFImageLoading - Fast & Furious Image Loading | 1,407 |
| 15 | RevitLookup | 1,366 |
| 16 | DSharpPlus | 1,316 |
| 17 | Mobius: C# API for Spark | 946 |
| 18 | Log4Net | 931 |
| 19 | bank-api | 834 |
| 20 | WebAPI Contrib | 770 |
| 21 | JsonApiDotNetCore | 716 |
| 22 | Twilio-csharp | 710 |
| 23 | mtapi | 677 |
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