IrfanView
I have been using IrfanView for image resizing, cropping, etc. since 2001 when I needed to create thumbnails of over 1000 cover images when I was webmaster for the official 2000 AD website. My version of the site, is now called BARNEY and can be found at 2000ad.org.
IrfanView is no good for drawing or layers – the closest I get to this with it is copying some background colour to paste over an unwanted feature.
Where it comes into its own is batch processing.
You can convert file types, rename or both.
These settings were used most recently to reduce the size of a set of face stimuli.
IrfanView is Windows only I’m afraid.