Treenity is described as 'brings structure to chaos. Link your ideas, notes and to-dos together! - Organize and track your tasks - Map and visualize your ideas - Plan and execute your projects Treenity is free to use on MacOS without limitations. Upgrade to the full version and enjoy:' and is an app in the Office & Productivity category. There are more than 10 alternatives to Treenity for a variety of platforms, including Mac, Windows, Linux, iPhone and Online / Web-based. The best alternative is XMind. It's not free, so if you're looking for a free alternative, you could try FreeMind or Freeplane. Other great apps like Treenity are vym (Free, Open Source), Wondershare Edraw MindMaster (Freemium), Heimer (Free, Open Source) and ThinkSpace : Mind Map & Note (Freemium).