So I have been trying to figure out a way to timeline my stories in such a way that it is free-form and I can add notes where necessary. I had been toying around with some mind-mapping apps, none were flexible enough but after reading some forums I found this!Black Obelisk
It's software designed for writers of all breeds. It has a bunch of tools; outlines, timelines, galleries, dossiers, checklists, playlists, planners...etc. All the tools work together and can communicate so you aren't retyping information into every single tool. I am pretty scattered when I write and this allows me to be scattered and still keep track of everything!
This software is awesome! The learning curve is not bad and there are very well done tutorials by rosepetals1984
There's a sale going right now where you can get the premium version $23! Check it out, I am really enjoying it.