Slack Events API - Subscribe to events in Slack via HTTP
Kibii - Discover exciting things to do!
B12 Bookings - Bookings scheduling software that integrates with your site
Event Hunt - Startups and Tech Events Curated By Locals
Guestboard - Lead powerfully-organized group events with Guestboard – a modular event platform that gives groups of 10-1000+ people a central space to coordinate, build excitement, and save money. No more crazy email threads. No more massive group texts.
Triip.me - The happiest way to travel in 227 countries