I used to have Folding@home on my computer, I ran it a few times, but my computer isn’t that fast or good at it apparently. Still, I did have it for a while, but ended up deleting it. I might download it again later.
An interesting list of projects… I haven’t run SETI@Home since way back when I had my 486.
One of my coworkers used to run SETI@Home until last month when he borrowed my wattmeter and discovered that it was costing him something like $20/year in extra electricity bills.