Common Lisp Open Code Collection (http://clocc.sourceforge.net/) is an archive of software for CommonLisp.  It may not still be being updated.  

There are also the following:
 
* AnotherSystemDefinitionFacility (ASDF) http://common-lisp.net/project/asdf/
* QuickLisp (http://www.quicklisp.org/)

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CategoryArchiveNetwork CategoryCommonLisp