Promomatic - Easily create beautiful app store assets
Visual Understanding Environment - Visual Understanding Environment (VUE) is a mind-mapping and concept-mapping tool.
AppLaunchpad - Create free beautiful screenshots for App store/Google play
Flying Logic - Highly visual software for planning support used by strategists, process improvement specialists, teachers, and writers. Windows, Mac OS X, and Linux.
Screenshot Designer - Create engaging App Store screenshots
FreeMind - FreeMind is a premier free mind-mapping software written in Java.