Web Package Surfer  

Web Package Surfer is a PHP-based package management system that lets you browse, search and administrate a set of files contained in packages that are classified by (possibly nested) categories. WePS is particularly useful for maintaining a repository of downloaded files.

Hosting Requirements: Unix
Price: Free (GPL)

   SourceWell  

SourceWell is a highly configurable software announcement and retrieval system entirely written in PHP and is based upon a MySQL database. It includes user authentication and authorization system (anonymous/user/editor/admin), sessions with and without cookies, high configurability, multilangual support, ease of administration, RDF-type document backend, advanced statistics, announcing mailing lists, application indexing by sections, installation support and many other useful features.

Hosting Requirements: PHP
Database: MYSQL
Price: Free (GPL)

   Project DB  

This site software manages projects, i.e. you can create projects, users, organisations and the membership of users in both. Everything can be in multiple languages. It has extensive access regulation through permissions.

Hosting Requirements: Unix
Price: Free (GPL)