Here are some: http://opendatastructures.org/ http://opendatastructures.org/ http://www.cgal.org/ http://www.cgal.org/ http://pigale.sourceforge.net/ http://pi

Here are some: http://opendatastructures.org/ http://opendatastructures.org/ http://www.cgal.org/ http://www.cgal.org/ http://pigale.sourceforge.net/ http://pigale.sourceforge.net/ http://www.algorithmic-solutions.com/leda/index.htm http://www.algorithmic-solutions.com/leda/index.htm Oh yeah, and this: http://graphics.stanford.edu/~seander/bithacks.html http://graphics.stanford.edu/~seander/bithacks.html It's not algorithms but it's amazingly useful, I reference it a few times a year. I want a copy of http://www.hackersdelight.org/ http://www.hackersdelight.org/ because I hear it's even better.