I often go to giveawayoftheday.com where each day a program is offered for free for one day, 24 hours exactly. The program is charged in other time. Different vendors put their software on this site, for promotion, maybe.

I would like to know is there any other site like this?

Or at least sites where I can get big discount for software, like boomerapp.com

Usually on boomerapp.com there is a program offered at 40% or less of its original price

And is there any other site like this?