Habitica - Habitica is a free habit building and productivity application.
Freeplane - Freeplane is a powerful and free software for building mind maps.
Coach.me - Coach.me is a coach that goes everywhere with you, helping you achieve any goal, change any habit, or build any expertise.
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
Loop Habit Tracker - Loop Habit Tracker (AKA uhabits) helps to create and maintain good habits in order to achieve their...
OmniOutliner - OmniOutliner is a writing app for collecting information, outlining ideas, adding structure to any sort of writing.