gThumb
Open Source
gThumb is an image viewer and organizer with a couple of limited options to also edit images.
Phatch
Open Source
Phatch (PHoto & bATCH) is a raster graphics editor used to batch process digital graphics and photographs. Phatch can be used on the desktop as a GUI program …
XnConvert
Free
XnConvert is a powerful and free cross-platform batch image processor, allowing you to combine over 80 actions.
