The DansGuardian Anti-Virus Scanner gives you the ability to virus-scan all content that passes through DansGuardian. It uses the scanning code from the MailScanner project to do the actual virus scanning, so it supports all the virus engines that the MailScanner project supports. The scanning is done as the file is being downloaded, so your current network apps don't have to be modified, etc. They just have to support using a proxy.
ProxIRC aims to be a proxy through which one can connect to an IRC server while also being able to connect to other instant messaging systems. Right now, partial support is offered for Microsoft's MSN using libMSN. Any IRC client can be used. Status of connected users in the MSN is made thanks to a virtual channel created by the proxy. When a user wants to talk to a friend from MSN, they /join #friend and talk. The rest of the channels are provided by a true IRC server and directly forwarded by the proxy. Only messages outgoing from the IRC client (which may be anyone) are parsed to look for information intended for the proxy. Information not useful for the proxy is forwarded to the IRC server.
LiteSpeed Web Server is a high-performance, secure, easy-to-use, and Apache interchangeable Web server. It supports HTTP/1.1, SSL, CGI, FastCGI, LSAPI, PHP, JSP, Servlets, GZIP compression, chroot, IP level throttling, connection accounting, DoS attack prevention, and instant recovery mechanisms. With its Apache compatible rewrite engine, .htaccess, and MS FrontPage support, migration is quick and easy. A Web interface is included for administration and configuration. It can be used as a content accelerator, compression proxy, or a security guard running in front of any Web and application server.