The best suite for working with photos ever created.
A lot more than a photo management application
This tool is really great. It does a lot more than just managing your pictures. There is an embedded editor (also available as a standalone application called showfoto) that allows a lot of modifications and fixes (filters, red-eye, reduce noise, aspect-ratio crop, and a lot more).
It's a must have !
An open, cross-platform journaling program.
A scientific plotting package.