Cloak is a library for multiplayer HTML5 games that handles client/server messaging, room/lobby management, and the fiddly edge cases that you don’t want to think about. It’s the plumbing you don’t want to fret over when you’re too busy designing your game.
Authors need a mastery of CSS's awkward underpinnings. While many learning sites preach specific techniques, Learn CSS Layout starts with the seedy underbelly of CSS in a way that can teach beginners and clarify for experts.
An Ancient Tome is a storytelling game. The main thing you do is write, much as if you were sitting down to write a short story. You and your co-authors will receive a randomly-generated and theme-appropriate Environment. You can respond by taking the story in whatever direction you want!
LetterBrush grew out of a tool I use for game development. It lets you edit text files with drawing tools such as lines and flood fill. Great for anyone developing Roguelikes.
A new game I wrote in a couple weeks to explore the idea of an IF murder mystery. It's very laid-back and takes about an hour to play, so check it out!