http://ellisonleao.github.io/magictools/ (http://ellisonleao.github.io/magictools/) - "A list of Game Development resources to make magic happen."
It's like the game-dev-only version of the massive list of free programming books and resources (https://github.com/vhf/free-programming-books/blob/master/free-programming-books.md), and even links to the officially released source code packages for complete games such as Doom, Quake, Prince of Persia, etc.
Going through the list myself, I'm thinking so far so good. It does NOT, however, list Sphere in the Engines/Frameworks section (or at all, for that matter). Let's figure out how to resolve that, shall we? ;)
Wow. That's a really useful resource!
Wouldn't it be neat to have one of our modern engine ports listed there? Haha, but first we'd have to finish them.