This implements and supersedes the Common Lisp Utilities, things that everybody writes since they're not part of the official standard. The code is stable and mature, tested on multiple Lisp implementations, and it has the kind of copious error checking that everyone wants but few ever have time to write.
It has a home page, with mailing lists and anonymous CVS. There is a manual which documents it pretty completely.
The license is public domain; in other words, there is no license, and you can do whatever you like with it and not fear legal repercussions. It's actively maintained by Peter Scott, even if there isn't a whole lot of activity most of the time.
This page is linked from: Common Lisp Utilities Peter Scott
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