iNoJB - iNoJB, formerly iNoCydia, is an amazing Cydia alternative requiring no jailbreak!
Chocolatey - The sane way to manage software on Windows.
Cydia - An alternative app store for jailbroken devices.
AppCake - AppCake is a website and mobile app that gives you a place to download apps for your iPhone from. The site features all sorts of apps, from games to productivity based apps. Read more about AppCake.
BuildStore - Safe and trustworthy alternative app store for iOS
Microsoft Store - A world of apps in the Microsoft Store.