FightAIDS@home
Like its name says, this project tries to find a cure for
AIDS. It is being developed by
Olson Laboratory. They try to find the right
molecules (shape + interaction specifics) that could fight the AIDS molecule.
One catch though: this is a for-profit organization and will run commercial project on your computer once in a while, it is less than 5%
according to their stats.
http://www.fightaidsathome.org/
Software is for Windows