PHP iAddressBook is a Web-based address book for a single user. It supports personal or business cards (tons of fields), spotlight-like search, categories, transparent vCard import/export, multi-language support, design templates, and an intuitive interface. It aims at 100% compatibility with the address book in Mac OS X.
Pondus is a personal weight manager that keeps track of your body weight. It aims to be simple to use, lightweight, and fast. The data can be plotted to get a quick overview of the history of your weight. A simple weight planner allows you to define "target weights" and this plan can be compared with the actual measurements in a plot.