Cydia - An alternative app store for jailbroken devices.
Startup Toolkit - Interactive how-to guides to launch your startup
BuildStore - Safe and trustworthy alternative app store for iOS
Techstars Entrepreneur's Toolkit - Online resource to help you learn about entrepreneurship
Get Mods APK - Get Mods APK offers a big collection of new and top-rated Android Mod Games, Mod Games, Premium Tools that you can download without signing up.
AwesomeHunt - Community-curated lists of learning resources on any topic.