Kepler's Light Chat System
A super simple chatbox program in 22 lines of code, plus however many for messages.
Written for TIC-80, but it should be really simple to swap things over to LOVE2D or PICO-8 just by switching the draw commands
Licensed CC_BY (Creative Commons Attribution). If you want to use it, just throw a lil "textboxes made with KLiCS" or something in there :)