It's not really a mind mapping application but when I need to jot down some complex idea I use yED. You can do all the normal things that flow chart tools can

It's not really a mind mapping application but when I need to jot down some complex idea I use yED. You can do all the normal things that flow chart tools can do but it has an amazing suite if auto arrange abilities that are highly customizable. Site: https://www.yworks.com/products/yed https://www.yworks.com/products/yed Or kick the tires on the web version (less feature rich) https://www.yworks.com/yed-live/ https://www.yworks.com/yed-live/