organize and delete unwanted media in a timleline
and also convert big photos to smaller size
but i'm open too hear whats available....
Possibly FastStone Image Viewer
My go to for regular image viewing is IView.
IrfanView ... one of the most popular viewers worldwide.
www.irfanview.com
Very comprehensive toolset.
For videos, many people will recommend Plex.
Absolutely does not work for me.
Most of my movies are ISO, and Plex does NOT index or work with ISO files.
I just name the files appropriately, and use VLC to watch.