Woo is a fast non-blocking HTTP server built on top of libev. Although Woo is written in Common Lisp, it aims to be the fastest web server written in any programming language.
Clack is a web application environment for Common Lisp inspired by Python’s WSGI and Ruby’s Rack.
Example:
(defvar *handler*
(clack:clackup
(lambda (env)
(declare (ignore env))
'(200 (:content-type "text/plain") ("Hello, Clack!")))))