(formerly)tangentmind.org

Earlier I mentioned that there were not any Humongous Games products in gametap. Gametap has a wide variety of children's games but I believe that some of the best of them are from Humongous games like freddi the fish, pajama sam, spyfox, and putt putt. However, gametap has recently added a number of them, which should make gametap more inviting for those with children. They're probably good enough to play even if you're not a child, though.

Also, they added some games from Novartis, whose games have been interesting because they sometimes use voxels. Their most common brands are Delta Force and Comanche. The games on gametap might not necessarily use voxels however.