Chocolatey - The sane way to manage software on Windows.
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
Scoop - A command-line installer for Windows
Fnd - Browse Apple App Store and iTunes on the Web
Ninite - Ninite is the easiest way to install software.
Cydia - An alternative app store for jailbroken devices.