LispCMS is about things like a virtual file system, sessions, users, an admin interface, and easy form making. See the docs for examples.
Although the main website is in Dutch, the code and docs are in English.
Currently, it only runs on CMUCL, but most of the code is written portably.
There is a download page with tarballs, .debs, and (for non-linuxers) a livecd.
CLiki pages can be edited by anyone at any time. Imagine a fearsomely comprehensive disclaimer of liability. Now fear, comprehensively