My additions to this list :
PDFill - Free PDF Tools - Merge, Split, Reorder, Delete Pages, Watermarks, Cropping and more. They also have a PDF Writer & Editor.
Clonespy - My preferred Duplicate File FInder
Everything - Very fast file search utility. I use this instead of crappy windows search.
AutoHotkey - Create Hotkeys/Macros/Automations for keyboard & mouse keys.