Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.
Galette - Galette is a membership management web application towards non profit organizations.
CrowdCompass - CrowdCompass offers mobile app development for conferences, meetings, conventions.
Bigtent - BigTent is a web-based organization and communication portal for groups.
EventMobi - EventMobi is an interactive mobile event app, audience response and engagement platform for conferences and trade shows.