I'd say RepRap. Not that it is "unknown", but strange it is not mentioned all that often when one thinks about from that first blogpost in -05 and what have happened since. Especially these days when you can get the plasticparts (clonedel), stepper motors on ebay and a small drillpress for cheaps. Not to mention tiny "one board", easy to solder through hole solutions like Sanguinololu.
Passwordmaker generates ditto for all my internets accounts, pinpadlocks etc. Runs on whatever you throw it at, as javascript, android, crapple, N900 (Thanks George (caco3)!), as CLI. Portable to say the least, mature and of course secure to the extent of what cards you got up your sleeve.
I use Zim to organize everything these days! It's stays out of your way and doesn't complicate things. It uses textfiles as database, which is really nice as you get access to your stuff quickly through a terminal for example. Ok, sure I long for the day that it gets say a Couchdb-plugin...
Redshift safes my eyes from getting cooked. I have yet to download that maemosandbox and compile it for my N900 though. There was a new release a few days ago btw, some new fine functions and not "just" bugfixes!