Celestron
An excellent telescope company that offers a wide range of telescopes, binoculars, spotting scopes, and optical accessories.

Meade
A highly reputable manufacturer of astronomical telescopes and optical instruments for the serious amateur.

Deepsky 2000 Pro
A high powered astronomy object database and log book program.

Lochness Productions
Planetarium products and other astro-educational supplies. Also, links to hundreds of planetariums all over the world.

Willmann-Bell Inc.
Books, charts, software, as well as mirror making kits and supplies.