Package editor
SimPE is a third-party program which allows you to view (and often work with) the "package" files that The Sims 2 uses. It's probably most used for viewing and editing - and occasionally fixing - various things about the Sims themselves. It allows you to add memories to Sims, change the family trees, and ressurect Sims you can't ressurect with the Ressurect-O-Nomitron.