This has been around for a while but
it's a nice collection of open source software with one or two items
that are really good.
VLC, for example is a great video player that just seems to cope
with anything you throw at it.
There are a couple of nice astronomy things, Celestia
which will appeal to some who like looking at the sky and wondering.
I really love the Really
Slick Screensavers which are far better quality than the naff
name implies. With no ads and very smart graphics I get wow noises
from even the coolest dudes in class. Well, a grunt asking where
I got them.
Plenty more, too, some featured i their own right on this site.
Whilst you can download the lot, you'll probably be best advised
to get just the ones you want to try individually from the originators'
sites to ensure you get the most up-to-date versions.