Collaborizm
Meet New People. Build Amazing Things. A workspace for aspiring Entrepreneurs, Engineers, and Creatives.
22 Alternatives To Collaborizm
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

Brüha
Brüha is your local entertainment and ticketing platform.

CrowdQuestion
Connecting Crowds Through Q&A The Right Way To Bring Everyone Closer To Their Community

Cvent
Cvent’s event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
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.

Eventbrite
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

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

GroupSpaces
Free Group Website, Membership Database, Listserv Mailing List, Online Group Management Software : GroupSpaces

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.
Let’s Try Sports!
Let’s Try Sports is a website for finding sports activities in your local area: tennis…
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.
Mobilizon
A free and federated tool to get our events off Facebook
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.
UMOOV
The activities and events nearby you.
Weemss
Weemss is an event management software that does the heavy work, so you get more time to enjoy the things you love.