vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Balsamiq - Balsamiq. Rapid, effective and fun wireframing software.
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
Invision - Prototyping and collaboration for design teams
Freeplane - Freeplane is a powerful and free software for building mind maps.
Zeplin - Collaboration app for UI designers & frontend developers