Chocolatey works on Windows and is FLOSS (Free and Libre Open Source Software) and it the primary method I personally use for updating and installing various programs. I've migrated nearly all of my usual programs to open-source alternatives. The ones that aren't open source are games (and game launchers) as well as storefront applications like Steam. So about 95% open-source system here (not counting the Windows OS of course).
Link: https://chocolatey.org/