Chocolatey - The sane way to manage software on Windows.
Windows Remix - Web-based batch software installer with zero dependencies. Recommended first visit after reinstalling Windows or buying a new laptop.
Scoop - A command-line installer for Windows
PDQ Deploy - Deploy software quickly with PDQ Deploy. It's simple to install just about anything to multiple computers on your network.
Ninite - Ninite is the easiest way to install software.
App Grid - App Grid is an alternative to the Ubuntu Software Center.