Ninite - Ninite is the easiest way to install software.
Scoop - A command-line installer for Windows
MacUpdate Desktop - MacUpdate Desktop makes managing and updating your applications easy and automatic.
Windows Remix - Web-based batch software installer with zero dependencies. Recommended first visit after reinstalling Windows or buying a new laptop.
Ubuntu Software Center - The Ubuntu Software Centre gives you instant access to thousands of free and open-source...
Just Install - just-install - The stupid package installer for Windows.