A very comprehensive list, but with shorter presentations, is at the Games in Education wiki. And here’s a newer, growing list of content generators. Speaking of content, it turns out there’s a list of voxel editors, including my own VoxelDesc. And TVTropes, of all places, has a rich catalog of game-making tools, with short descriptions. Some of them are very obscure, too.
An article from March 2012 lists several HTML5 games, along with tutorials, libraries and game-making apps. It also points to this huge list of HTML5 game engines and frameworks. Another such list is at Game From Scratch. And speaking of that, here’s an article on How to Make A Simple HTML5 Game With Enchant.js.
Interactive fiction authoring systems
CYOA authoring systems
The website for my own Ramus features a comparison with Undum and ChoiceScript.