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.
Rainbows! is an HTTP server for sleepy Rack applications. It is based on Unicorn, but designed to handle applications that expect long request/response times and/or slow clients. For Rack applications not heavily bound by slow external network dependencies, consider Unicorn instead as it simpler and easier to debug.
Boa is a single-tasking HTTP server. That means that unlike traditional Web servers, it does not fork for each incoming connection, nor does it fork many copies of itself to handle multiple connections. It internally multiplexes all of the ongoing HTTP connections, and forks only for CGI programs (which must be separate processes), automatic directory generation, and automatic file gunzipping. Tests show boa is capable of handling up to several hundred hits per second on a 100 Mhz Pentium, dozens of hits per second on a lowly 20 MHz 386/SX, and thousands on more powerful CPUs.
Restlet is a REST framework for Java. It supports all REST concepts (Resource, Representation, Connector, Component, etc.) and is suitable for both client and server Web applications. It supports major Web standards like HTTP, SMTP, XML, JSON, WADL, and Atom. Many extensions are also available to integrate with Servlet, Spring, Jetty, Grizzly, Simple, JAXB, JAX-RS, JiBX, Velocity, or FreeMarker. A GWT version is also available.
Easy Hosting Control Panel for Ubuntu is designed for hosting multiple domains on a single machine. It aims to be easy to install and use, simple, and functional. It currently supports Apache, DNS, MySQL, FTP, and email configuration. It mainly uses the apt-get install system, so it can be installed on any Debian-based distribution, including Ubuntu. It features one-click installs, subdomains, password protected domains, email forwarding, domain transfer to another user, multiple templates, server backup and restore, and different menus for the server administrator, reseller, and domain administrator.
mod_layout is an Apache module that provides both a Footer and Header directive to automagically include output from other URIs at the beginning and ending of a Web page. It can be used to wrap documents for a standard look and feel for a site (or to insert banners on any given document in a site). Currently known to support mod_perl, PHP and Apache JServ. Should support just about any type of handler.