NationBuilder - The world's first platform for leaders, handcrafted from scratch to help you grow your community and lead them to action.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Crowded Communities - The all-in-one community platform.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
FUEL CYCLE by Passenger - Think Passenger builds online platforms that allow brands to connect, create and communicate with key stakeholders.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.