Prophiler is a web based filebrowser. All simple features of desktop filebrowsers are implemented. A powerfull plugin-system let's you write and configure your own plugins, templates, languages, utils etc.1 weekly downloads
A mod_perl-based RPC API designed for ease of setup, ease of extension, and rapid development. Using Presto, you can develop a robust, fully "web-2.0" web application in a day or two. Oh and it scales. Take that, Ruby on Rails.