A helpful scientific calculator that runs in your web browser window.
Holt Online Learning

Parallel Lines, and Pairs of Angles
math is fun

Given a pair of parallel lines cut by a transversal find the measure of all the angles. Answers included,
MathDrills.com

Given a pair of parallel lines use your knowledge of corresponding and supplementary angles to determine the measurements of the angles marked with a question mark.
MathDrills.com

Given a pair of parallel lines use your knowledge of alternate angles to determine the measurements of the angles marked with a question mark. Answers included.
MathDrills.com

This interactive quiz allows you to test your knowledge on complementary and supplementary angles, as well as all the special angle pairs with the transversal of parallel lines.
Mr. Martini's Classroom

An interactive applet showing the way the angle values change but the relationship between angle pairs does not.
Saltire Software Geometry Gallery

Parallels and Transversals
Math is Fun

This "Jeopardylike" game reviews basic geometry vocabulary and parallel lines/angles vocabulary
Quia

Parallel Lines and Angles Cut by a Transversal
mathnstuff
