Mobilizon
A free and federated tool to get our events off Facebook
22 Alternatives To Mobilizon
Agorakit
Agorakit is web-based, open source groupware for citizens.
Attendize Event Ticketing
Attendize is a free & open-source ticket selling and event management platform
Collaborizm
Meet New People. Build Amazing Things. A workspace for aspiring Entrepreneurs, Engineers, and Creatives.
Cvent Supplier Network
The Cvent Supplier Network (CSN) is the world’s largest directory of event venues.
DownToMeet
DownToMeet is a platform to organize, find, and attend group events.

Emamo
Simple event tools for organizations. One central hub to manage your events and members — all year long.

EventCast
EventCast is an app that helps you schedule events and easily invite participants to subscribe.
EventVenueFinder
Discover the best event venues and locations worldwide!

Eventbrite
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Eventzilla
Eventzilla lets you sell tickets online and manage attendees from one integrated application.

Get Together
Get Together is an open source event manager for local communities.

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.

Kommunity
Explore communities that share your passion with millions of people
MeetApp Event
Create an awesome event experience by using our MeetApp app for your event, meeting or conference.
Meetabit
All the local tech and startup meetups in one place - easy to organize & attend

Meetup
Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Open Event
The simplest way to create events
Openki
Platform where you can search, propose, take part, help organize or publish workshops, lectures…

Picatic
Picatic encourages event organizers to create a custom website, sell tickets and then determined their cost of use. Selling out events is easy with Picatic.
SkillMint
Find, meet and rate people with common skills and interests. Community-driven rating system.
Stuff
A platform for invitations to private and public events.

Ticket Tailor
Ticket Tailor is an easy to use event ticketing platform that puts you in control.