ASDF is a tool for describing how source files are organized: what depends on which and when. I.e., it is Another System Definition Facility.
If you want to use ASDF with other people's systems, see the getting started guide. For details on defining your own systems, you should browse the manual.
Though they may lag behind the version here, ASDF comes bundled with most Lisps. To get the greatest and latest, you can:
git clone http://common-lisp.net/project/asdf/asdf.git We're still working out the details. For now, send email to gwking@metabang.com or the project mailing-list with questions or patches.
Saturday; June 6, 2009 - updated website and added oos shortcuts like load-system.
Sunday; May 3, 2009 - moving towards git and Common-Lisp.net