RoboJournal is a cross-platform journal/diary tool written in Qt/C++. Right now, RoboJournal only supports MySQL but support for SQLite (and possibly Postgres) will be added in future releases. RoboJournal runs on Windows and Linux.
I would like to eventually support RoboJournal on OSX but unfortunately I have no reliable way to build or maintain a Mac version right now.
YANG (Yet Another Network Generator - Java) enables you to generate social networks given various social rules observed in the real population. Uses: generate realistic networks to be used in individual-centric models, teaching or benchmarking.
A web app designed to display genealogy information. Data can be stored in one of several databases including MySQL. Supports multiple languages. The look and feel can be changed easily using the built in templating system.