vBulletin - Build a community website with the leading forum software, vBulletin 5 Connect, or in the cloud on vB Cloud!
Mobilize - Mobilize is a scalable messaging app built for large groups.
Higher Logic - Private, secure online communities that stimulate conversation and ignite engagement.
Crowded Communities - The all-in-one community platform.
NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.
FUEL CYCLE by Passenger - Think Passenger builds online platforms that allow brands to connect, create and communicate with key stakeholders.