I use sumatra for how lightweight and fast it is. 7zip is just uncontested. I wish Ditto had copycats on linux and macos. It's just sublime.
I've never used irfanview though, I'm too quick to judge from the UI of an app xD
I see all those buttons on IrfanView and how it opens as an explorer of pictures rather than just a simple Photo Viewer with arrows to go back and forth and closed it. qView is my fav right now. It does exactly what I need from a viewer. It views. I rarely need editing.
Nowadays if I need editing I just open Photopea.
If I need batch editing/converting I open XnConvert.
tl;dr IfranView is probably amazing, but just like all those buttons on np++ I pre-judge and find simpler things
I haven't used Ditto so I don't know how closely macOS clipboard managers compare to it, but there's certainly a fair number of programs for the Mac out there that sound similar to Ditto's own description, from the free, open source Maccy to the somewhat over-the-top $13 Pastebot. There are other utility programs that include similar functionality; personally, I'm using Alfred, a keyboard-driven launcher, which also includes a pretty good clipboard manager (and is the sort of app that I'd be looking for copycats for on Linux if I ever made the switch back!).
I've never used irfanview though, I'm too quick to judge from the UI of an app xD
I see all those buttons on IrfanView and how it opens as an explorer of pictures rather than just a simple Photo Viewer with arrows to go back and forth and closed it. qView is my fav right now. It does exactly what I need from a viewer. It views. I rarely need editing.
Nowadays if I need editing I just open Photopea.
If I need batch editing/converting I open XnConvert.
tl;dr IfranView is probably amazing, but just like all those buttons on np++ I pre-judge and find simpler things