PICO-8 - Lua-based fantasy console for making and playing tiny, computer games and programs.
8bitdash - Animated 8-bit browser home screens
TIC-80 - TIC-80 is a fantasy computer where you can make, play and share tiny games.
PixaTool - Convert any image or video into pixel art 👾
LowRes NX - Make your own games in BASIC on the LowRes NX fantasy console
BatMUD - Oldest and largest text-based MMORPG