Bash's powerful command line editing in cmd.exe
Asio C++ Library
Statically recompiled PC port of The Nightmare Before Christmas: Oogie's Revenge (Xbox): up to 4K, ultrawide, 120 fps, ray-traced ambient occlusion, gamepads, the game's own menu. Bring your own disc.
An open source re-implementation of Chris Sawyer's Locomotion
The open source framework for sample based instruments
Source code for the book Real-Time C++, by Christopher Kormanyos
Falcon Player
Metroid Prime through Metaforce, native and optimized for MacOS, iOS, and iPadOS