These free tools have proven themselves for me and my clients. I hope you find them useful:
ActiveWords http://www.ActiveWords.com/
My favorite time saver - navigate, open, search using text vs mouse-miles traveled. I especially like
the text substitution and integration with my Notes mail client.
Check out this video on using activeWords to save time with Google/Gmail
http://www.activewords.com/videos/AWforGoogle.html
Ninite – An easy way to get a bunch of free tools and install them all at once.
https://ninite.com/
Ccleaner – Originally Crap Cleaner for windows
http://www.piriform.com/ccleaner/download
Search Everything – superfast file finder
http://www.voidtools.com/
Auslogics – Disk defragmenter (dont use on SSD disks)
http://www.auslogics.com/en/software/disk-defrag/
FastStone Image Viewer 5.1 Freeware (Last Update: 2014-03-11)
http://www.faststone.org/download.htm