Treenity is described as 'brings structure to chaos. Link your ideas, notes and to-dos together!' and is a Mind Mapping Tool in the Office & Productivity category. There are more than 25 alternatives to Treenity for a variety of platforms, including Mac, Windows, Online / Web-based, iPhone and iPad. Most alternatives are Mind Mapping Tools and Project Management Apps. The best alternative is FreeMind, which is both free and Open Source. Other great apps like Treenity are TheBrain (Freemium), MindMeister (Freemium), MindNode (Freemium) and SimpleMind (Freemium).