An absolutely wonderful tool for worldbuilders, and a must have for any writer.
It's a direct window to the large world inside your head, and what's more: one you can show other people!
You can add text, images and timelines to organize everything as you please. One of its best features is that you don't need an internet connection to use it or save it so it's very convenient. Also it's a WIP so it will get even better eventually.
Thanks for this, I really needed it.