Anybody know a good mind mapping website for lore?

Basically my worldbuilding project is getting kinda convoluted. All the stuff is on a doc and some scribbled down on paper but I remember seeing somewhere about a good website for mindmaps and cataloguing lore and storyline in some kinda website. I forgot what it was called but still liked the idea (felt more convenient) so does anyone here have any good suggestions or similar websites they can think of? Thanks