Gitscout - A beautiful Github Issues experience for macOS
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
VarCI - The missing assistant For GitHub issues
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Shrink for Github - A macOS app for your Github issues
Bigtent - BigTent is a web-based organization and communication portal for groups.