Bundles bundles bundles

hi guys :) it wasn't so long ago that i discovered this site, along with others and a lot of bundle sites.
but i sometimes see a lot of games coming on here and i have no idea where they are coming from and why there are so many giveaways of them.

i have a couple of giveaway websites in my bookmarks, please feel free to post more down below or any other awesome websites that have anything to do with bundles etc.

www.humblebundle.com
www.store.indiegala.com
www.indiegala.com
www.bundlestars.com
www.groupees.com
and sometimes http://www.alienwarearena.com/ has some nice things on there.

is this just about every possible (steam game) bundle or discount site? or are there still sites i have to see?

thanks :)