This Diary app for android, by Bill Farmer, has made it a pleasure to keep a diary of short observations. I wasn't a diary writer until I installed it about two years ago and now I have been using it nearly every day, ever since.

Organic Maps is a great open source app for casual every-day navigation. It has an easy-to-read map display, navigation directions with voice, search for places, save favourite places and add new places, and not a lot else. The usability is decent and it looks good.

It's become my default mapping app, and it makes me ever so happy to have such a good open-source solution.