This is software for authors, a planning tool. I bought it years ago and love it. And I'm a pantster. I'm allergic to plotting.
Here's Randy Ingermanson's famous article about his Snowflake method for designing a story. It walks you through manually what the software program will take you through incrementally. I just reread it and am enamored all over again. I've already added this to my Favorite Links in my sidebar. Plus you may cut and paste this path into your browser: http://www.advancedfictionwriting.com/art/snowflake.php.
Randy then created the computer software program, aptly named Snowflake Pro. You can purchase it on his website, while you sign up for his informative newsletter. Do both here: http://www.advancedfictionwriting.com.