TOKENS for Mac: Tokens makes it remarkably easy to generate, share, and track promo codes for your iOS and Mac apps.
Animoog iPad Synthesizer: We found it very useful for creating sound effects for our app. However, if your so inclined to, you could go much further than that and create the whole soundtrack. It generates very interesting sounds.
iOS App Icon Template
iPad GUI PSD | A Photoshop template containing all the major iOS elements.
BreakTime: It's easy to forget your ass in the chair when using all these wonderful app dev tools. BreakTime is a simple mac app that reminds you not to.
A Photoshop extension for creating precise or multiple guides with ease. Really useful in the graphic design process.
Pngyu: Another tool for reducing png sizes. This time with a lossy compression, great for when that's not a problem.
It's a good idea to get your app size as small as possible. Images are probably the largest asset in your app, so if their size can be reduced it's a good idea to do so. ImageOptim is a great tool for doing that losslessly.
Bitly: For statistics and for organizing all the links used in the app. The service also shortens the urls but that's less relevant in this case.
Adobe Audition: The tool we used for editing the voice over and all the sound effects in our app.