Akihabara
Akihabara (source) is a framework for creating retro games in JavaScript and HTML5. The heavy lifting is done with the canvas tag, and the author provides several libraries for dealing with common game-related tasks:
- Gamebox helps move objects and handle collisions, renders monospaced fonts, and stores data
- Gamecycle handles menus and gameover
- Toys provides lots of common routines like graphical effects, bullets, bonus screens
- Help has JavaScript enhancements and helpers
- Tool includes developer tools
- Trigo has maths functions
- Iphopad helpers support touch-based helpers
If you’re not convinced, try playing one of the games. Solitude is pretty good! Make sure you get the keyboard controls right: Z key is the A button.