You know the feeling—you're writing something, and the ideas are flowing, but you don't know where to put them all. That's what openworldcrafter is for. It keeps your thoughts, ideas, and notes in one place and gives you the freedom to organize them however you wish. Oh yeah, and it's free!
openworldcrafter is like a personal wiki for your book, but in app form. You can give each character or concept its own page and link them together with hyperlinks. You can fill out Character Sheets and have them compiled into a spreadsheet for you. You can even embed images and videos if you want. Those are just a few of the app's neat features; you can go to the documentation for more info: https://www.openworldcrafter.com/resources/docs/index.htm