Xmind - Xmind is a brainstorming and mind mapping application.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
MindNode - Delightful Mind Mapping for your Mac, iPad and iPhone. MacCapture Your Thoughts. Any idea starts with a loose collection of .
Standard Notes - A safe place for your notes, thoughts, and life's work
MindManager - With MindManager, flexible mind maps promote freeform thinking and quick organization of ideas, so creativity and productivity can live in harmony.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.