Taskful - Deadlines, meet your match.
ForumFree - ForumFree allows you to create a forum or a blog in a few simple steps.
Streaks - The to-do list that helps you form good habits.
Proboards - ProBoards is a host of free forums with customer service.
ToDoBook - Turn your Facebook (& other social media) News feed into a to-do-list.
Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android