Chocolatey - The sane way to manage software on Windows.
Scoop - A command-line installer for Windows
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.
App Grid - App Grid is an alternative to the Ubuntu Software Center.
Aiiguide - Aiiguide is a library of more than 200,000 applications that you can download and install on Windows and macOS.