Xmind - Xmind is a brainstorming and mind mapping application.
Zeplin - Collaboration app for UI designers & frontend developers
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Mightytext - Send & Receive SMS Text Messages from your computer. Sync'd with your Android #
Mindomo - Easy-to-create and share mind maps, concept maps, task maps and outlines. Mind mapping software for Web, Desktop, iOS and Android. Mind map with us for free!
Abstract - A secure, version-controlled hub for your design files