I’m not sure you noticed but I’m a software junkie I love to get software for free and with all what is available on the net (as freeware, open source or promo offers) the choice is really endless. Here just some (but really few) of the things available around:

PaperCut 1.1.1 Alpha

“A software for creating, decorating, and printing paper models for assembly” found via wareseeker.

The Doll Collector Professional (to keep track of your collection if you have enough patience).

What looks like a cute game to try, for a bored adult or to keep busy for a while a child : Fashion Cents, the trial limited version is free but the complete full version is not.

And, last but not least, Google SketchUp for your dioramas and modelling activities, it is an awesome software, I just never seem to find the time to dig into it