This is probably the nicest manpage site I’ve come across:
I haven’t heard of it. They imported 98,660 manpages from all available Debian packages plus some from other sources. The type is clean. URLs are short and sweet. Manual sections are presented in a nice TOC on the left. They have some other novel features like comments on each manpage.
I planned to do something very similar. I even registered mancutter.org. A great number of manpages are distributed under a liberal license. I wanted to throw up a nice and simple site and then ship a tool anyone could run to bomb roff up to the server for all manpages on a machine. You should be able to gather all Linux and BSD manpages fairly quickly with such a system. Or, you could push up a specific set of manpages so project maintainers could publish directly to the site. I might still but man.cx is a huge chunk of what I was looking for.