Scrivener website will tell you all you need to know. I apologize that the link here takes you straight to check out. Just click on products and start toodling about.
Or check it out on the iTunes store: Scrivener. Or just take my word for it. Scrivener is the bomb.
Aeon Timeline - Scribble Code . This timeline generator helps me keep my storylines straight and keeps me from muddling my generations. Best of all, it syncs with Scrivener! You can get a trial copy at Scribble and here are a few discount codes just for fun: CAMPWRITER or SUMMERFEST
The last on my hit parade tonight (because I really should be writing: 700 words to go) is Snowflake Pro and if you leave a comment, I'll tell you how to get it for half-off.
It's a complete plot and plan application and I really should have started with this one 15 years ago when I started my story. I'll be using it tonight to try to crumple up some of my flatter characters.