Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
RapidClipse - RapidClipse is a web-based development platform that allows you to build the app with Java and provides you with a hustle-free configuration.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
EntelliFusion - Data Fabric
Bigtent - BigTent is a web-based organization and communication portal for groups.
Rivery.io - Rivery is a web-based development platform that is used to manage, create, control, and monitor a large number of data pipelines.