ASCIIpOrtal

It's like portal, but in ASCII. And 2D. Sweet look-through mechanic, tho.

CymonsGames

All the programs from Cymon's Games, a repository of C/C++ programs inspired by Type-Ins of old. lots of great educational material.

Arduino-PlayToneMelodyString

Make music with an arduino and speaker. These functions turn a string into a song. Great for kids, schools, and makerspace activities.