Quite often answers to topics include references to free software. More often than not the sites where these freeware applications can be downloaded are not given.
Being a download junkie, mainly for assessing new applications, I have some favourite sites that I know to be safe.

Below is a list of sites I recommend. These sites do their best to avoid applications that contain spyware and adware.

Sourceforge
Majorgeeks
Shellcity
Livedownloads
All4you FreewareWorld

Other sites I use occasionally:

Freewarearena
Sover
Webgrid
321Download
Gpick
Klitetools
Pricelesswarehome
Buzzys
Nonags
Foundstone
Radified

These are recommended sites only.
As with any download, normal safeguards should be followed. Check out an application from reviews and/or other user's opinions before downloading. Always scan any download for viruses and/or spyware