The customization section is interesting, though it is missing things such as multiply & conquer, table wrapping, and the mask & jump techniques, but then, you aren't going to find every custom technique covered in any one text. Sine, cosine, and atan, usually used dual interweaving tables that wrapped, and for distance, you could use a short table and a long table that used Manhattan distance to do the lookup depending on whether X > Y or Y > X.

Edit: I see a link to another github on that page to sqrt implementations. I suspect that will make for interesting reading too.