It is designed with the purpose of providing the goodies of CLOS programming, but in an object-based environment. As such, it shares a lot of syntax and semantics with CLOS, including multiple delegation (similar to multiple inheritance) and multiply-dispatched functions (similar to generic functions).
Homepage: http://redmine.sykosomatic.org/projects/show/sheeple
Source repository: http://github.com/sykopomp/sheeple/
language extension, MIT-LICENSE