There is an app for the iPad called "Popplet." This app is very similar to Inspiration software (a computer based program) Inspiration Maps (an app) and Webspiration (the web-based version) for brainstorming ideas.
Since we all have access to different devices, I thought I would give you some options.
- Inspiration (for desktops) http://www.inspiration.com/
- Inspiration Maps (for iPads $9.99) https://itunes.apple.com/us/app/inspiration-maps/id510173686?mt=8
- Popplet (for iPads $2.99) http://popplet.com/
- Webspiration (web-based, Internet) http://www.mywebspiration.com/