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Top 4 C++ C# Projects

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  1. FlatBuffers

    FlatBuffers: Memory Efficient Serialization Library

    Project mention: Protocol Buffers in Elixir | dev.to | 2026-06-26

    This article was just a warmup, a kind of sandbox to see the capabilities of Protocol Buffer. At the same time, I was also looking to the FlatBuffers protocol trying to identify the difference between both format. I would prefer to use CBOR for my projects, but I would also like to avoid using too much dependencies from unknown repositories. Furthermore, protobuf Dart package is already used by Dart and Flutter (for metrics IIRC), it can also be used for messaging as well.

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  3. Squirrel

    An installation and update framework for Windows desktop apps

  4. FlaxEngine

    Flax Engine – multi-platform 3D game engine

    Project mention: Rewriting Bun in Rust | news.ycombinator.com | 2026-07-08

    > It’s up there with Stride

    Edit: I mean that it's up there with Flax: https://flaxengine.com/ whoops.

    Stride, Flax and jMonkeyEngine are all pretty cool, not just Godot and O3DE!

  5. MathParser.org-mXparser

    Math Parser: Java, C#, C++, Kotlin, Android, and all .NET platforms (Nuget, Maven, CMake). Supports .NET Framework, .NET Core, .NET Standard, Xamarin, and more. Features: rich built-in library of math functions, operators, constants. Flexible in user-defined arguments, functions. Expressions provided as plain text. Easy to use. Well documented.

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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Index

What are some of the best open-source C# projects in C++? This list will help you:

# Project Stars
1 FlatBuffers 26,308
2 Squirrel 7,979
3 FlaxEngine 6,966
4 MathParser.org-mXparser 953

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