TIC-80 - TIC-80 is a fantasy computer where you can make, play and share tiny games.
Report Nest - Supercharge performance across your organization
PICO-8 - Lua-based fantasy console for making and playing tiny, computer games and programs.
TrackDuck - Visual feedback for web design and development.
WASM-4 - Build retro games using WebAssembly for a fantasy console
Pastel Bookmarklet - Mark up any website from your browser, for free