Freshmeat page: http://freshmeat.net/appindex/2000/03/22/953754092.html
mod_extract_forwarded hooks itself into Apache's header parsing phase and looks for the X-Forwarded-For header which some (most?) proxies add to the proxied HTTP requests. It extracts the IP from the X-Forwarded-For and modifies the connection data so to the rest of Apache the request looks like it came from that IP rather than the proxy IP.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!