API List - A collective list of APIs. Build something.
iNoJB - iNoJB, formerly iNoCydia, is an amazing Cydia alternative requiring no jailbreak!
Phantombuster - A marketplace of simple to use no-code APIs
Apple App Store - Install apps on your iDevice via the App Store.
The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.
Cydia - An alternative app store for jailbroken devices.