Top 23 Unity Open-Source Projects

1. ILSpy

   1 42 25,473 9.6 C#

   .NET Decompiler with support for PDB generation, ReadyToRun, Metadata (&more) - cross-platform!

   

2. ReSharper

   www.jetbrains.com featured

   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.

   

3. 3d-game-shaders-for-beginners

   2 13 19,497 0.0 C++

   🎮 A step-by-step guide to implementing SSAO, depth of field, lighting, normal mapping, and more for your 3D game.

   

4. ml-agents

   3 60 19,495 7.4 C#

   The Unity Machine Learning Agents Toolkit (ML-Agents) is an open-source project that enables games and simulations to serve as environments for training intelligent agents using deep reinforcement learning and imitation learning.

   

5. UniTask

   4 23 10,941 6.3 C#

   Provides an efficient allocation free async/await integration for Unity.

   

6. unity-mcp

   5 6 10,844 9.9 C#

   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: Is MCP a security concern for game developers? | dev.to | 2026-04-07

   Community projects, like those from CoplayDev and CoderGamester, focus on speed and flexibility. They expose many parts of the Unity editor as MCP tools, which makes them great for experimentation and fast iteration.

7. dnSpy

   6 8 10,469 8.7 C#

   Unofficial revival of the well known .NET debugger and assembly editor, dnSpy (by dnSpyEx)

   

8. xLua

   7 3 10,107 6.6 C

   xLua is a lua programming solution for C# ( Unity, .Net, Mono) , it supports android, ios, windows, linux, osx, etc.

   

9. SaaSHub

   www.saashub.com featured

   SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

   

10. Il2CppDumper

    8 12 8,937 4.0 C#

    Unity il2cpp reverse engineer

    

11. MultiplayerNetworkingResources

    9 11 8,552 5.5 C

    A curated list of Multiplayer Game Network Programming Resources

    

    Project mention: Show HN: M. C. Escher spiral in WebGL inspired by 3Blue1Brown | news.ycombinator.com | 2026-04-05

    Yes, if you intend to make a networked game, write your netcode first, share state with client(s) over a network protocol, even if the network is 127.0.0.0/8

    Netcode is its own area of study:

    - https://developer.valvesoftware.com/wiki/Latency_Compensatin...

    - https://developer.valvesoftware.com/wiki/Source_Multiplayer_...

    - https://github.com/0xFA11/MultiplayerNetworkingResources

    Gamers have opinions about netcode, because it affects how they have to think in order to play the game, so netcode becomes as much a creative endeavour as the level design, graphics, etc.

    Every area of endeavour you've mentioned is a fractal of timesuck. They all have their basics and then their advancements, that have been built up by thousands of people over decades.

    If you are learning by doing, for god's sake, keep it simple. Make the simplest thing that works. If you're making an FPS, have static geometry and non-animated character models (a 2D sprite will do). Prioritise having the most basic thing working as your goal. Otherwise you will be off in the weeds for years and you'll probably give up having built nothing.

        what day 0 to day 1000 of a game looks like

12. BepInEx

    10 72 8,071 6.5 C#

    Unity / XNA game patcher and plugin framework

    

13. AssetRipper

    11 20 7,706 9.5 C#

    GUI application to analyze game files

    

14. UnityURPToonLitShaderExample

    12 6 7,658 5.0 ShaderLab

    A very simple toon lit shader example, for you to learn writing custom lit shader in Unity URP

    

15. Entitas

    13 4 7,627 0.0 C#

    Entitas is a super fast Entity Component System (ECS) Framework specifically made for C# and Unity

    

16. UIEffect

    14 2 7,372 7.4 C#

    UIEffect is an open-source package that allows you to intuitively apply rich UI effects directly from the Inspector or via code. Combine various filters, such as grayscale, blur, and dissolve, to decorate your UI with a unique visual style!

    

17. MessagePack for C# (.NET, .NET Core, Unity, Xamarin)

    15 23 6,710 6.9 C#

    Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin). / msgpack.org[C#]

    

    Project mention: zerompk: The Fastest MessagePack Implementation for Rust and Its Optimization Techniques | dev.to | 2026-03-29

    Many parts of the optimization and security features were implemented referencing MessagePack for C#. The MessagePack for C# implementation is incredibly well done. However, optimizing code like binary decoding is definitely easier in Rust than in C#. Having a strong type system makes writing with generics incredibly easy and enjoyable.

18. Harmony

    16 26 6,529 8.2 C#

    A library for patching, replacing and decorating .NET and Mono methods during runtime

    

19. GameDevMind

    17 9 6,358 9.1 C++

    最全面的游戏开发技术图谱(Game Development Map)。帮助游戏开发者们在已知问题上节省时间，省出更多的精力投入到更有创造性的工作中去。

    

20. Unity-Script-Collection

    18 3 6,335 3.8

    A maintained collection of useful & free unity scripts / library's / plugins and extensions

    

21. Mirror

    19 24 6,215 9.1 C#

    #1 Open Source Unity Networking Library

    

    Project mention: How I Built a Scalable Lobby for a Real-Time Mobile Racing Game | dev.to | 2026-02-09

    In the prototype stage, we choose Mirror as a networking engine for both matchmaking and gameplay. Mirror was a great match as it was open-source and had a great community on Discord, giving me the ability to extend the library as needed in the long run.

22. puerts

    20 1 6,098 9.8 C++

    PUER(普洱) Typescript. Let's write your game in UE or Unity with TypeScript.

    

23. MixedRealityToolkit-Unity

    21 18 6,069 0.0 C#

    This repository is for the legacy Mixed Reality Toolkit (MRTK) v2. For the latest version of the MRTK please visit https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity

    

    Project mention: GameDev Guardian: static analysis and Unity | dev.to | 2025-08-01

    However, sometimes a programmer makes a mistake and forgets to use it, just like in the MixedRealityToolkit-Unity project:

24. open-project-1

    22 34 6,038 0.0 C#

    Unity Open Project #1: Chop Chop

    

25. projectlearn-project-based-learning

    23 5 6,000 3.8 TypeScript

    A curated list of project tutorials for project-based learning.

    

26. SaaSHub

    www.saashub.com featured

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    

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