Vanilla Forums - Build an engaging community forum using Vanilla's modern cloud forum software.

Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Forumbee - Forumbee offers community forums for discussions, feedback and Q&A.

Influitive - Influitive helps companies increase customer lifetime value and accelerate sales with the power of their own customer advocates. Inspire your customers to stay longer, share their experiences, and attract new business.

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.