Higher Logic - Private, secure online communities that stimulate conversation and ignite engagement.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Tribe.so - Tribe is a white-label platform, empowering the new generation of online communities.
Basecamp - A simple and elegant project management system.
Discourse - Discourse is an open source discussion platform built for the next decade of the Internet.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.