Freshmeat page: http://freshmeat.net/projects/tinyproxy/
Tinyproxy is a fast light-weight HTTP proxy for POSIX operating systems. Designed from the ground up to be fast and yet small, it is an ideal solution for sites where a full-featured HTTP proxy is required, but the system resources for a larger proxy are unavailable. Tinyproxy is fully compatible with all existing Web browsers and has a number of useful features.
License: GNU General Public License (GPL)
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!