Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Nicebreak - Virtual events for your team that they will love
Zoho Backstage - Plan, run, and analyze your event— all from one place
HyHyve - Online networking with real-life interactions
Meetup for iOS and Android - Discover groups that are all about the things you love
Wonder.me - Join over 100,000 hosts on wonder.