Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Xmind - Xmind is a brainstorming and mind mapping application.
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.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
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.
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.