MyPHPBib is a web application for managing bibliographic references. It can import references in several formats (e.g., EndNote and RIS), as well as importing references directly from PubMed. MyPHPBib is written in PHP and uses MySQL as the database.
To see what MyPHPBib looks like, visit this bibliography of bird evolutionary trees.
MyPHPBib can be downloaded from SourceForge.
MyPHPBib requires MySQL, PHP 4, Perl 5, and various libraries. On a reasonably recent Unix system this shouldn't be a problem, but your mileage may vary. To get started look at the requirements, then work through the installation steps.
User documentation is still rudimentary, but there is a quick guide to using MyPHPBib.
MyPHPBib was written by Rod Page.