SWeTE is an HTTP reverse proxy that provides website translation. You can set up proxies for any sites, then connect a translation memory to the site to have it translated into any language. It provides a web-based translation form, and an option to translate strings using Google's translation API.
A flexible and extensible Python identd which can act as a reverse proxy, forwarding requests to other machines on the network. Based on Twisted. Currently only supports Linux, but hopefully will extend to other platforms.