javascript-based

Construct 3 is a powerful 2D game development engine which uses Scirra's intuitive event system to allow its users to build all kinds of games and apps.

Quest 6 is a full re-write of Quest, an interactive fiction app, to pure JavaScript. It's a framework for creating parser-based text adventures.

miniPaint is free online image editor using HTML5. Edit, adjust your images, add effects online in your browser without installing anything. You can use the Electron based version of the editor if you like.