Free stuff for everyone!
I make free resources for app developers. You can download them here.
Ad Calculator
An excel calculator to help you calculate which advertisement types would be profitable and effective for your app business.
iOS Sketch Paper
A free PDF of to-scale wireframes of Apple devices. Comes with guidelines for measurements (such as halfway and thirds) as well as standard UI elements.
Marketing Directory
An excel file with a list of hundreds of websites and blogs, big to small, that cover tech and app news.