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Top 23 Dotnetcore Open-Source Projects
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ILSpy
.NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Bot Builder SDK
Bot Framework provides the most comprehensive experience for building conversation applications.
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Electron.NET
:electron: Build cross platform desktop apps with ASP.NET Core (Razor Pages, MVC, Blazor).
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SaaSHub
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Quartz.NET is a full-featured job scheduling library that supports complex schedules, persistence, and clustering, making it ideal for enterprise applications.
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NPOI
a .NET library that can read/write Office formats without Microsoft Office installed. No COM+, no interop.
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Coravel
Near-zero config .NET library that makes advanced application features like Task Scheduling, Caching, Queuing, Event Broadcasting, and more a breeze!
In the .NET ecosystem, there are a few great libraries for scheduling or queuing background work. I created Coravel as an easy way to build .NET applications with more advanced web application features. But it's mostly known as a background job scheduling library.
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Cake (C# Make) is a cross-platform build automation system with C# DSL.
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In C#, we simulate this using the excellent OneOf library.
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TensorFlow.NET
.NET Standard bindings for Google's TensorFlow for developing, training and deploying Machine Learning models in C# and F#.
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FluentEmail
All in one email sender for .NET. Supports popular senders (SendGrid, MailGun, etc) and Razor templates.
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Awesome-Microservices-DotNet
💎 A collection of awesome training series, articles, videos, books, courses, sample projects, and tools for Microservices in .NET
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FastReport
Free Open Source Reporting tool for .NET6/.NET Core/.NET Framework that helps your application generate document-like reports
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To substitute the object creating a mock, we'll use the NSubstitute package. This article will not cover how to use the NSubstitute, but to explain the basics we say to the code "When someone calls method X, returns the value Y", so the result is a fake value.
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Project mention: PeachPie Compiler: Compile and run PHP on top of .NET runtime | news.ycombinator.com | 2024-10-08
we have attempted to use it for that, but it was really hard and we ended up rewriting from scratch.
The activity graph on GitHub says it is mostly dead. There is some activity, but at best it is in maintenance mode. It used to be sponsored, but not anymore IIRC
https://github.com/peachpiecompiler/peachpie/graphs/contribu...
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App.Metrics
App Metrics is an open-source and cross-platform .NET library used to record and report metrics within an application.
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Fusion
Build real-time apps (Blazor included) with less than 1% of extra code responsible for real-time updates. Host 10-1000x faster APIs relying on transparent and nearly 100% consistent caching. We call it DREAM, or Distributed REActive Memoization, and it's here to turn real-time on!
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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).
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A note from our sponsor - SaaSHub
www.saashub.com | 22 May 2025
Index
What are some of the best open-source Dotnetcore projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | ILSpy | 22,885 |
| 2 | SteamTools | 22,074 |
| 3 | modular-monolith-with-ddd | 12,092 |
| 4 | Ocelot | 8,533 |
| 5 | dnSpy | 8,284 |
| 6 | Bot Builder SDK | 7,683 |
| 7 | Electron.NET | 7,448 |
| 8 | QuartzNet | 6,742 |
| 9 | NPOI | 5,915 |
| 10 | Markdig | 4,755 |
| 11 | Coravel | 4,124 |
| 12 | Cake | 3,996 |
| 13 | OneOf | 3,747 |
| 14 | TensorFlow.NET | 3,342 |
| 15 | FluentEmail | 3,104 |
| 16 | Awesome-Microservices-DotNet | 2,933 |
| 17 | FastReport | 2,827 |
| 18 | NSubstitute | 2,813 |
| 19 | PeachPie | 2,418 |
| 20 | App.Metrics | 2,226 |
| 21 | Fusion | 1,878 |
| 22 | dotNext | 1,767 |
| 23 | PixiEditor | 1,739 |
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