Curtis Blanco has put together a coordinate geometry book that is free for use. If you are homeschooling or looking for additional geometry problems for a class, you can get it here. Updates are being made on a regular basis so check back periodically.
I got into an interesting discussion with a teacher in Massachusetts and he sent me a link to a Euclid’s geometry book online that is pretty neat. This is more for schools and teachers as a resource, but some of you parents or engineers may enjoy checking this out.