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
A demo of a procedurally generated dungeon in Unity, created with Braxton DeHate for a CS project.
Template-based text generation for procedural text adventures.