p5-Module-Pluggable provides a simple but, hopefully, extensible
way of having 'plugins' for your module. Obviously this isn't going
to be the be all and end all of solutions but it works for me.

Essentially all it does is export a method into your namespace that
looks through a search path for .pm files and turn those into class
names.

Optionally it instantiates those classes for you.

Homepage:
https://metacpan.org/release/Module-Pluggable
