Link: Plugin Licenses, Upsells and Add-Ons

Hey there! I'm currently working on a CLI tool to deploy WordPress apps to DigitalOcean. Check it out! It's free and open source.

Mika shared some interesting thoughts about Plugin Licenses, Upsells and Add-Ons. Take a look at the comments too, where Otto explains some of his ideas on using basic WordPress actions and filtres to activate/deactivate pro and free features.