Raycraft is a simple voxel raytracer using Minecraft worlds written in Pike. It's a learning project for me as I had never done any raytracing before, so the algorithm is absolutely terrible, but it works :) It also includes a simple parser for Minecraft worlds which is decoupled from the rest of the project.
This project is mainly an experiment and a playground if you will for experimenting with raytracing, so it may change or break quite heavily over time.