Freshmeat page: http://freshmeat.net/projects/perl-httpd/
This is a really simple and compact HTTP daemon, written in Perl. It runs fine on most UNIX-like Operating Systems (Tested on FreeBSD, OpenBSD, Darwin and Linux). And it should mostly work on NT machines using with ActivePerl.
The whole thing was really a learning experience, so I suppose if anything it could be used as a teaching tool. But it's certainly capable of running a low-trafic web server.
License: BSD Licence
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!