Swarm is an app store for the design community. It connects Designers who need tools with the Superusers who are building them. Swarm allows design teams to discover and share solutions that empower creatives to do their best work. More info here core.thorntontomasetti.com/announcing-swarm

How to Build a Swarm App

Building and Editing Swarm Apps: Part 1

Building and Editing Swarm Apps: Part 2