Agorakit
Agorakit is web-based, open source groupware for citizens.
20 Alternatives To Agorakit
Attendize Event Ticketing
Attendize is a free & open-source ticket selling and event management platform
Channels
Channels is a simple way to post about, find, and chat about anything quickly and anonymously.
ChurchInviter
Church Invitations makes it easy to add invites and ecards to your church website! With tons of features its easy to see why so many churches are using it to send christian ecards!
Collaborizm
Meet New People. Build Amazing Things. A workspace for aspiring Entrepreneurs, Engineers, and Creatives.
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.
Gospeak
A platform to help meetup organizers and speakers grow together.
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.
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
Open Event
The simplest way to create events
OpenSports
Used by thousands of sports groups around the globe, OpenSports is the gold standard for managing events, attendees, and payments.
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.