Logic Software from CSLI Hyperproof, Tarski's World, Turing's World, and The Language of First-order Logic, educational logic software by Jon Barwise and John Etchemendy http://www-csli.stanford.edu/hp/ Stanford.edu~Site InfoWhoisTrace RouteRBL Check
Infinity Exploring the logical basis and practical meaning of infinite sets. http://www.c-parr.freeserve.co.uk/hcp/infinity.htm Freeserve.co.uk~Site InfoWhoisTrace RouteRBL Check
The Logic Classroom A course in basic logic consisting of 5 studies with exercises and answers to promote the learning of logic. Homeschool, college, and seminary students. http://www.sjsu.edu/faculty/carranza/ Sjsu.edu~Site InfoWhoisTrace RouteRBL Check