phpABook is a simple address/contact management system that uses PHP and MySQL. It provides many features that you would find in a similar offline, OS specific application. It is also has multi-user capabilities.
easy to install, comes with a good instruction. Don't forget the permission settings per file (chmod -R). The design and information you can store are simple, as described. The color is green. The size of the letters, quite small but it does resize well if you want to zoom. I like the feature that it tells you when an entry was modified, unfortunately it doesn't tell you when it was created, although the database keeps that data as well. If you look for an AdressBook with more functionality, have a look at: php-addressbook on sourceforge