Araneida: a free Common Lisp-based web server
Araneida is a small extensible Common Lisp web server for SBCL, originally written as a project to learn CL, but these days maintained because cl-http is not free. It powers CLiki, the Common Lisp Wiki.
Content is provided by exporting URL handlers to cover parts of the server URL space. A handler is a CL object that takes a 'request' as argument and eventually prints out a web page on the stream associated with that request. See e.g. http://cvs.telent.net/cgi-bin/viewcvs.cgi/*checkout*/araneida/doc/example.lisp
While it can be used as a standalone web server, it's "optimized" to live behind an appropriately-configured Apache proxy server.
Related links (external):
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!