wepidia is a set of two PHP files which allow you to browse through an entire picture collection, located in the same directory or in the subdirectories as the two files. It also offers the ability to add comments to the pics, for which it uses a MYSQL database. The files are highly configurable, and very easy adjustable. Other features include a location bar, customizable colors, and relocation of the layout.
The SMDP (Standard MP3 Database Project) provides a standard schema for MP3/ogg databases, APIs for numerous languages, and a few utility programs to aid in managment of the database. The goal is to standardize the format of MP3/ogg databases while making it easier for developers to incorporate database support into their MP3/ogg applications.