OpenMoneyBox is an application designed to manage small personal budgets in the easiest way.
Check the homepage to download apps/packages for additional Operating Systems.
PyOrganizer is a cross-platform (Python/GTK) personal organizer, with a GUI optimized for the Nokia Internet Tablets (n810, n800, and n700). The financial/budgeting features are now operational, and rudimentary mileage tracking has just been added.