Wow, there are a lot of links to games and activities here. Be sure to check out Little Explorers. Enchanted Learning also produces Busy Little Brains, a Mac only software title. Ideas That Play The Buddy Brush series of cd-roms produced by this company are refreshingly different. These software titles give your child a chance to explore an interactive world of color and music.
Most programs here are shareware.
But each comes with a built in trial period, so you can try before you buy. Also, older Mac only titles are freeware. There are also games and activities to try online. Ohio Distinctive Software Cool software for all ages here. Yep, even grownups.