Xmind - Xmind is a brainstorming and mind mapping application.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.