Cloning a pluggable database takes time, and for environments where you'd like to use clones as part of unit testing or other elements of Agile development, it would be nice to be able to bring a clone into operation in the smallest time possible. One mechanism for that is sparse storage clones aka snapshot copy, but depending on your database version and your storage infrastructure, you might hit some limitations.
Enter Plugzilla! This PL/SQL package allows you to clone pluggable databases extremely quickly by having pluggable database pre-cloned in advance.