CLOS-like generic functions. New generic functions and methods can be added on previousy defined classes.
Generic functions can have a multiple arity and support multi-methods.
It is also possible to design new metaclasses. Meroon is really fast. The source files of Meroon are available. A lightened version of Meroon exists, named Meroonet , in a single file, without libraries nor complex bootstrap. Meroonet is fully described in the LiSP book .