As far as I can tell there are no strings attached outside of free registration. All of this software is, obviously, for Mac, so I put it here. It's just free, licensed software:
ShoveBox - a draggable "inbox" or "todo" list in your menu bar, I might use this
WriteRoom - full screen, plain text editing for writing your novel. I probably won't use it.
Twitteriffic - uh, no.
TinyGrab - probably useful to people who need to share screenshots to share with others - I know that if my parents were on a Mac and my mom was trying to explain something to me, I'd have her use this to make a screenshot and upload it automatically. Kinda neat.
Hordes of Orcs - tower defense game
MarinerWrite - not available yet, but will be if this bundle reaches 500k downloads. It's a word processing app, and it's supposed to be pretty lean.