Hostsman Manage Multiple Hosts files from one utility.
PC Decrapifier inventories all the bloatware (HP/Dell Utilities, etc) on a PC based on user-driven feedback and recommendations and removes them sans-uninstallers. Great for cleaning useless shit off out-of-the-box PCs.
Recuva undelete software that restores deleted files, as well as files on damaged or freshly formatted drives. Paid corporate licensing but free for personal use wink wink nudge nudge.
NirSoft has utilities to do nearly anything you want to do from sniffing passwords out of FTP/HTTP/SMTP traffic on your network to editing Outlook NK2 Autocomplete files to retrieving your Windows/Office product key to a nice viewer for BSOD minidump files.
Screen Connect Free Use this to create a free tech support portal for yourself for personal use.