A .NET layer for Common Lisp. It enables Common Lisp applications to interact with .NET libraries. [Open source, BSD-style license] http://weitz.de/rdnzl/
An open source implementation of the Common Lisp Interface Manager, a portable and standardized library for constructing user interfaces. http://common-lisp.net/project/mcclim/
Web server coded in Common Lisp; supports HTTP/1.1 chunking, persistent connections (keep-alive), and SSL; works only with LispWorks. http://weitz.de/hunchentoot/
Common Lisp extension, adds support for nondeterministic programming, and on this base, provides full constraint programming language to formulate and solve mixed systems of numeric and symbolic constraints. Description, download. http://www.cis.upenn.edu/~screamer-tools/