The website winaddons.com has a list of 300 freeware programs. I am using several
of the listed programs myself, and the ones I use have proven to be both useful
and robust. This list appears to be very comprehensive.
An amazing feature of this list is that they don't actually have copies of the programs that they
list. Instead, they have links to the websites that are responsible for
their listed programs. That way, you are not downloading software from a
third party with its inherent risks. So here is the link:
http://www.winaddons.com/top-300-freeware-software