Hunchentoot is a robust and easy to use HTTP server. As a stand-alone web server, Hunchentoot is capable of HTTP/1.1 chunking (both directions), persistent connections (keep-alive), and SSL, but it can also sit behind the popular Apache using Marc Battyani's mod_lisp.

Hunchentoot currently works with LispWorks (which is the main development and testing platform), CMUCL (with MP support), SBCL (with Unicode and thread support), OpenMCL, and ACL.

It's written by Edi Weitz and can be found at

Cyrus Harmon has contributed support for virtual hosts, CGI, and authentication in Hunchentoot.

2011: Hunchentoot has moved to github at

A basic tutorial on using Hunchentoot for Lisp web apps is available here