I run a paid addon for local e-commerce platform(with 25k shops build on it). It all started about 15 month ago when i was still working in a web development company. The platform owners came to us and offered us a partnership. We would develop some new addons for them, run them, and split the profits(80% for us, 20% for them). As i was the one most interested in this i got the first project and developed and supported it for about 9 month. I saw it could have a nice future and bought it from the web development company and quit the job. Now i run it by myself and i love it.

The addon provides an easy way to print paper labels for products and other things listed in the shops.