I think there are quite a few of these.

One that springs to mind is OpenPSP. I haven't tried it though.

You might also want to look at Jellybean by chromatic - looks like a very nice project.

I'd imagine that a search on SourceForge or fm would bring up some interesting Perl web server type things. There is also a CPAN module which impliments most of the httpd code for you if you want to start your own - I forget which one it is, Net::Server or HTTP:Daemon I think

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