Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Event Hunt - Startups and Tech Events Curated By Locals
Standuply - Run daily standup meetings and track your metrics in Slack
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
MeetNotes - Increase Productivity with Meeting Notes Tool. More effective minutes, Prepare Agenda, Collaborative Notes & Action Items.