There are 3 repositories under cplusplus-20 topic.
C++ Insights - See your source code with the eyes of a compiler
Header-only TOML config file parser and serializer for C++17.
A new 3D game engine for Linux and Windows using C++20 and Vulkan API 1.3, in very early but ongoing development
Free open-source modern C++17 / C++20 framework to create console, GUI (forms like WinForms) and unit test applications and libraries on Microsoft Windows, Apple macOS and Linux.
A minimalist single-header library for building pattern-matchers, lexers, and parsers.
A C++20 header-only library that supports powerful reflection for C++
Munt is a witness-secured decentralized network for payments, digital assets, finance and more
C++20 Dynamic Reflection Library
Electra is an esolang where you code like an electrician.
Various documents and code related to proposals for WG21
TeaScript C++ Library - embedded scripting language for C++ Applications
Custom engine based on OpenXRay engine. Global mod for S.T.A.L.K.E.R. - Call of Pripyat.
async io-uring based kernel io library
A C++20 serialization library (cereal fork)
Сonservative, move-only equivalent of std::function
A dynamic microsimulation framework for python
This is the JamTemplate for kickstarting your gamejam entry. It will compile C++20 code for native (Win, Linux, Mac) and web (webassembly) games.
Experimental project for learning computer graphics using vulkan API and c++.
C++ genetic algorithms scientific library
The C++ compendium of knowledge based on "The C++ Programming Language Fourth Edition" by Bjarne Stroustrup
Highly optimized, constexpr-ready collection streams for C++17/20.