Project ideas

HTTPS engine, allowing TLS etc on top of HTTP
Imgui library
Job queue
TOML serialization and deserialization
Classic games: Tetris, Asteroids, Snake, Space Invaders, Pac Man, Defender, Frogger, Donkey Kong, Surround, Breakout, Galaxian, Centipede, Pole Position, Lunar Lander, Q*bert!, Dig Dug.
Protobuf library
MySQL bindings
Postgres bindings
Thread safe allocators
Lua bindings for embedding Lua
SVG library
Proxy server
Emulators, GBA, Atari 2600 etc emulators
Cross platform sound and music library
XML serialization and deserialization