There are 2 repositories under procedural-algorithms topic.
free and open source voxel art tools - editor, thumbnailer and format converter
Procdural dungeon generator for Unity3D
A procedural galaxy generator in C# for .NET and Mono.
Testing different world generation methods in the web. Implemented with HTML5, Javascript and three.js
Procedural maps with Perlin noise and erosion with leaflet and web workers
Template-based text generation for procedural text adventures.