Top 23 Cpp20 Open-Source Projects

1. modern-cpp-tutorial

   1 4 25,880 8.4 C++

   📚 Modern C++ Tutorial: C++11 to C++26 On the Fly | https://changkun.de/modern-cpp/

   

   Project mention: Modern C++ Tutorial: C++ 11/14/17/20 On the Fly | news.ycombinator.com | 2026-05-28

2. AppSignal

   www.appsignal.com sponsored

   AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.

   

3. modern-cpp-features

   2 47 21,902 7.0 Python

   A cheatsheet of modern C++ language and library features.

   

4. Modern-CPP-Programming

   3 9 16,208 6.6 C++

   Modern C++ Programming Course (C++03/11/14/17/20/23/26)

   

   Project mention: Modern C++ Programming: Busato | news.ycombinator.com | 2026-05-02

5. openage

   4 57 14,486 6.5 Python

   Clone of the Age of Empires II engine 🚀

   

6. entt

   5 82 13,177 9.7 C++

   Gaming meets modern C++ - a fast and reliable entity component system (ECS) and much more

   

   Project mention: EnTT | news.ycombinator.com | 2026-05-10

7. awesome-modern-cpp

   6 17 13,126 1.5 HTML

   A collection of resources on modern C++

   

8. PrismLauncher

   7 231 10,627 9.9 C++

   A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)

   

   Project mention: PrismLauncher VS onyx-launcher - a user suggested alternative | libhunt.com/r/PrismLauncher | 2026-07-30

9. SaaSHub

   www.saashub.com sponsored

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

   

10. doctest

    8 21 6,890 8.3 C++

    The fastest feature-rich C++11/14/17/20/23 single-header testing framework

    

11. nghttp2

    9 4 5,064 9.6 C++

    nghttp2 - HTTP/2 C Library and tools

    

12. infinity

    10 4 4,734 9.2 C++

    The AI-native database built for LLM applications, providing incredibly fast hybrid search of dense vector, sparse vector, tensor (multi-vector), and full-text.

    

13. cppinsights

    11 27 4,672 5.3 C++

    C++ Insights - See your source code with the eyes of a compiler

    

    Project mention: C++ Insights – See your source code with the eyes of a Compiler | news.ycombinator.com | 2026-10-01

    The tool can be found at - https://cppinsights.io/

14. awesome-hpp

    12 7 4,186 5.0

    A curated list of awesome header-only C++ libraries

    

    Project mention: Canvas_ity: A tiny, single-header <canvas>-like 2D rasterizer for C++ | news.ycombinator.com | 2026-02-21

    that's a common pattern in C++ land because there is no standard way to use libraries in C++

    https://github.com/p-ranav/awesome-hpp

15. Osiris

    13 55 3,885 8.4 C++

    Cross-platform game hack for Counter-Strike 2 with Panorama-based GUI.

    

16. compile-time-regular-expressions

    14 31 3,863 5.3 C++

    Compile Time Regular Expression in C++

    

    Project mention: Is Rust faster than C? | news.ycombinator.com | 2026-01-14

    Other examples are CTRE (https://github.com/hanickadot/compile-time-regular-expressio...) and format string compilation (https://fmt.dev/12.0/api/#compile-api). The closest C counterpart is re2c which also requires external tooling.

17. thread-pool

    15 6 3,066 1.7 C++

    BS::thread_pool: a fast, lightweight, modern, and easy-to-use C++17 / C++20 / C++23 thread pool library

    

18. quill

    16 9 3,049 9.2 C++

    Ultra-low-latency asynchronous C++17 logging and metrics library for performance-critical applications (by odygrd)

    

    Project mention: Quill vs spdlog: Which C++ Logger Is Better for Low-Latency Applications? | dev.to | 2026-06-18

    Quill was designed for a narrower problem:

19. userver

    17 6 2,982 9.9 C++

    Production-ready C++ Asynchronous Framework with rich functionality

    

    Project mention: Came across the async framework userver 3.0 recently – they've moved to C++20 | news.ycombinator.com | 2026-05-28

20. concurrencpp

    18 17 2,757 0.0 C++

    Modern concurrency for C++. Tasks, executors, timers and C++20 coroutines to rule them all

    

21. fooyin

    19 4 2,537 9.9 C++

    A customisable music player

    

    Project mention: Classic 7 is a Windows 10 LTSC mod to look 1:1 to Windows 7 | news.ycombinator.com | 2026-05-14

22. async_simple

    20 3 2,207 6.5 C++

    Simple, light-weight and easy-to-use asynchronous components

    

23. tomlplusplus

    21 24 2,167 5.5 C++

    Header-only TOML config file parser and serializer for C++17.

    

24. less_slow.cpp

    22 11 1,927 7.6 C++

    Playing around "Less Slow" coding practices in C++ 20, C, CUDA, PTX, & Assembly, from numerics & SIMD to coroutines, ranges, exception handling, networking and user-space IO

    

25. cpp

    23 7 1,669 1.6 C++

    C++ Tip Of The Week

    

26. SaaSHub

    www.saashub.com sponsored

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

    

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• A note from our sponsor - AppSignal
  www.appsignal.com | 15 Oct 2026

  Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise. Learn more →

Index

Sponsored

AppSignal knows why the f*#k it crashed.

Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.

www.appsignal.com