Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
SuperNotecard - Introducing SuperNotecard. SuperNotecard is an online writing tool that features virtual notecards to help arrange facts or scenes, track details, organize paragraphs, and clarify your composition process.
Angle 2 Mockups - A giant Sketch Library for creating app presentations
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.
Balsamiq Mockups 3 - New public beta for the popular prototyping tool
Freeplane - Freeplane is a powerful and free software for building mind maps.