Open Source Microsoft Photos Alternatives

I don't know if Irfan View is open source or not, but it is free & it's perfect for viewing & quick simple edits. Sometimes I fire up a VM to run it on Linux for some niche tasks.

Ente

Not open source but freeware and really simple and powerful. Absolutely no BS program and it just gets right to the business.

https://www.faststone.org/

I've used it for years on Windows. I wish there was a similar program for Linux thats just freaking works.

Forgot to mention that it is stupid farst since it preloads images into memory so it can display images instantly hence the name. Perfect for browsing network shares. I only used the faststone image viewer, so not sure how the other programs work but I'm sure they are great too.

I haven't needed one since I somehow managed to uninstall the new one and downgraded it to the Windows 7 version of the photo viewer, but ImageGlass looks nice!

I really like nomacs: https://nomacs.org/