1. GcemA C++ compile-time math library using generalized constant expressions
2. FluffosActively maintained LPMUD driver (LPC interpreter, MudOS fork)
3. String View Litestring_view lite - A C++17-like string_view for C++98, C++11 and later in a single-file header-only library
4. LyraA simple to use, composable, command line parser for C++ 11 and beyond
5. UltimateppU++ is a C++ cross-platform rapid application development framework focused on programmer's productivity. It includes a set of libraries (GUI, SQL, Network etc.), and integrated development environment (TheIDE).
6. Csv[DEPRECATED] See https://github.com/p-ranav/csv2
9. StduuidA C++17 cross-platform implementation for UUIDs
10. XeniumA C++ library providing various concurrent data structures and reclamation schemes.
12. DrillSearch files without indexing, but clever crawling
13. PerlinnoiseHeader-only Perlin noise library for modern C++ (C++17/C++20)
16. BvhA modern C++ BVH construction and traversal library
17. OpentimerA High-performance Timing Analysis Tool for VLSI Systems
19. Ogsr EngineOGSR Project - Evolution of X-Ray Engine for S.T.A.L.K.E.R.: Shadow of Chernobyl
22. GoespCross-platform streamproof ESP hack for Counter-Strike: Global Offensive, written in modern C++. Rendering and GUI powered by Dear ImGui.
23. Aegis.cppDiscord C++ library for interfacing with the API. Join our server:
24. Seqan3The modern C++ library for sequence analysis. Contains version 3 of the library and API docs.
26. DppDirectly include C headers in D source code
27. Variant Litevariant lite - A C++17-like variant, a type-safe union for C++98, C++11 and later in a single-file header-only library
28. VolbxGraphical tool for data manipulation written in C++/Qt
29. TeTE: C++17 Run-time polymorphism (type erasure) library
30. WisprendererRTX Ray Tracing Renderer, made by Y3 students at Breda University of Applied Science
34. Baulkbaulk - Minimal Package Manager for Windows
35. UecsUbpa Entity-Component-System (U ECS) in Unity3D-style
37. RubeusA cross platform 2D game engine written in C++ for beginners
39. OpenminerMinecraft-like game engine written in C++17 with a client/server architecture and support for Lua modding
40. ShivaModern Cross-Platform C++ Engine with modularity (MIT). Maintains here: https://github.com/KomodoPlatform/antara-gaming-sdk
41. CubbyflowVoxel-based fluid simulation engine for computer games
42. PomdogAn open source game engine for C++20 🐶 🎮
43. OpendsTemplate Library of Data Structures in C++17
44. EventbusA lightweight and very fast event bus / event framework for C++17
48. OzoOZO is a C++17 Boost.Asio based header-only library for asyncronous communication with PostgreSQL DBMS.
49. VariantEggs.Variant is a C++11/14/17 generic, type-safe, discriminated union.
50. Scelta(experimental) Syntactic sugar for variant and optional types.