Web User Interface is a stripped down version of WebPages that scans the directory structure of a webserver for personal homepages of its users, and then builds a list of all available personal homepages. Specifically, this program searches users' home directories for a subdirectory called public_html containing an index file such as index.html.
mod_dav enables Apache to understand the WebDAV protocol (extensions to HTTP). WebDAV stands for "Web-based Distributed Authoring and Versioning", and is defined by RFC 2518. WebDAV is intended to replace proprietary authoring protocols such as those used by Frontpage or NetObjects' Fusion, but is also a complete set of protocols for manipulating a webserver's files and directories, and their properties.
RabbIt is a mutating, caching Web proxy used to speed up surfing over slow links like modems. It does this by removing advertising and background images and scaling down images to low quality JPEGs. RabbIT is written in Java and should be able to run on any platform. It does depend upon an image converter if image scaling is on. The recommended image converter is "convert" from the ImageMagick package.
The HTML Pre-Processor is a perl5 script that does basic including, #defines, and assertions for HTML, much like cpp(1) does for .c source files, but it is lacking a lot of cpp's features (and internal complexity). HPP is useful for simple site includes and conditionals on sites that do not have SSI or where its useful to have pages "pre-compiled", and may be useful just to do a unified look n feel throughout your pages.