I am a huge fan of open source software, for most needs there is a free program out there to fit them, however
you should always be wary when selecting them, because there are also programs that claim to be free, but in reality
are bundled with adware or spyware, and in some cases even viruses.
A few programs that I recommend everyone have on their PC are:
an excellent program for checking the S.M.A.R.T. status
of your hard drive and the temperatures on your computer if your hard drive and motherboard support those features. The link is about halfway down on the downloads page. DO NOT click any of the download buttons on the first page they are ads.
An excellent open source photo editing tool.
A free alternative office suite that is capable of opening most Microsoft Office formats. I does not include an email client though, so for that I recommend...
which is developed by the folks that develop Firefox.
Alternate Web Browsers:
Safari for Windows
(No longer supported or being updated use at own risk)