TheAppStore.org - Find apps by rating, price, category, updated date and more
Just Install - just-install - The stupid package installer for Windows.
AppSales - Find the best Android apps and games from Google Play that are currently discounted or free for a limited time
Scoop - A command-line installer for Windows
Fnd - Browse Apple App Store and iTunes on the Web
Aiiguide - Aiiguide is a library of more than 200,000 applications that you can download and install on Windows and macOS.