Jigsaw is W3C's leading-edge Web server platform, providing a sample HTTP 1.1 implementation based on RFC2616 and a variety of other features on top of an advanced architecture implemented in Java. Jigsaw provides both client and server HTTP/1.1 implementations, is fast, easy to extend, flexible, and is also packaged as a ready-to-run HTTP/1.1 proxy-cache.
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.
uIP is probably the smallest implementation of the TCP/IP protocol stack ever written in a high level language; the code footprint is on the order of a few kilobytes and RAM usage is on the order of a few hundred bytes. uIP is intended to be used in embedded systems running low end 8- and 16-bit microcontrollers.
Yaws is a WWW technology with capabilities similar to the combination of Apache with PHP and a database. Yaws runs faster, with smaller footprint, higher scalability, and higher reliability. Subjectively speaking, it uses a more beautiful technique to generate dynamic pages than other similar technologies.
LiteWebServer (LWS) is a small, modular Web server and Java web container. It is based on code from Apache's popular Tomcat server, tweaked and extended for easier installation and management. It consists of a set of modules that can be installed separately, so you can install and manage exactly the features you need. The base module provides basic Web server features (HTTP/1.1 support) and support for the Servlet API. Add-on modules provide additional features, such as JSP support. Installing new modules and upgrading or removing existing modules is as easy as can be with the bundled JustGetIt module manager.
Sharedance is a high-performance server that centralizes ephemeral key/data pairs on remote hosts, without the overhead and the complexity of an SQL database. It was mainly designed to share caches and sessions between load- balanced PHP Web servers. Access to a Sharedance server is trivial through a simple PHP API and it is compatible with the expectations of PHP 4 and PHP 5 session handlers with no code change.