Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Gitscout - A beautiful Github Issues experience for macOS
Facebook Local - Discover places to go and events happening near you
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