Just Install - just-install - The stupid package installer for Windows.
TheAppStore.org - Find apps by rating, price, category, updated date and more
Scoop - A command-line installer for Windows
AppSales - Find the best Android apps and games from Google Play that are currently discounted or free for a limited time
Windows Remix - Web-based batch software installer with zero dependencies. Recommended first visit after reinstalling Windows or buying a new laptop.
Fnd - Browse Apple App Store and iTunes on the Web