Printful for Messenger - Create and sell print-on-demand merchandise with Messenger
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
ThreadMeUp - The Custom Apparel Platform
Event Hunt - Startups and Tech Events Curated By Locals
Eaze - Uber for medical marijuana
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets