LifeDigger - Evolving personal knowledge base
TheBrain - TheBrain: The Ultimate Digital Memory
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Learn Anything - Search Interactive Maps to Learn Anything
ConceptDraw MINDMAP v10 - Easy tool for mind mapping and data structuring (Mac/ PC)
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.