I wrote about Sledge development in my blog, detailing the process I go through when implementing a new feature (decal rendering in this case). If you're interested in Sledge or programming it might interest you.
The post is here: Decal Rendering In Sledge
(For those who don't know, Sledge is a project I have worked on for a long time, it's intended to be a replacement for Goldsource Hammer and hopefully, eventually, Source Hammer as well. It's completely open source which means the code is available to all to use, modify, and add new features. It's not finished yet, however I hope to release a beta sometime this year.)
If you do take a look, please let me know any feedback you might have. Is this kind of thing interesting? Would you read something like it again? Am I just a nerd who likes really boring stuff? Let me know in the comments! (either on the blog page or here on TWHL)