Ninite - Ninite is the easiest way to install software.
Just Install - just-install - The stupid package installer for Windows.
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
Paket - Paket is a dependency manager for .NET and mono.