Just Install - just-install - The stupid package installer for Windows.
Patch My PC - Patch My PC Updater is a free, easy-to-use program that keeps over 300 apps up-to-date on your computer.
Scoop - A command-line installer for Windows
FileHippo App Manager - Scan your computer for installed apps to check if updates are available.
Windows Remix - Web-based batch software installer with zero dependencies. Recommended first visit after reinstalling Windows or buying a new laptop.
Ninite - Ninite is the easiest way to install software.