With a full feature-set, configurable gui and a strong focus on plain productivity, Krita is at home on every artist's desktop.
HexChat is an IRC chat program. It allows you to join multiple IRC channels (chat rooms) at the same time, talk publicly, private one-on-one conversations etc.
NConvert is a powerful command line multi-platform batch image processor with more than 80 commands.
GEDCOM Validator is a tool for checking a GEDCOM file with the GEDCOM specification.
ProcessThreadsView is a small utility that displays extensive information about all threads of the process that you choose. The threads information includes the ThreadID, Context Switches Count, Priority, Created Time, and more...
Mystic Thumbs 64-bit v.1.98 (last freeware version)
The definitive image thumbnail generator for Windows Explorer.
Mystic Thumbs generates thumbnails of many image types not natively supported by Windows. It does this transparently and in the background for Explorer so you don't have to run a seperate application to preview your images.
It is a native Windows Explorer plugin which means you don't have to do anything other than install it. This means you don't have any new interfaces to learn, think about or otherwise deal with.