ImageMagick
Open Source
ImageMagick is a free and open-source software suite for displaying, converting, and editing raster image and vector image files.
GraphicsMagick
Open Source
GraphicsMagick is a utility of image processing.
XnConvert
Free
XnConvert is a powerful and free cross-platform batch image processor, allowing you to combine over 80 actions.
Compare FastStone Photo Resizer with alternatives
Compare ImageMagick and FastStone Photo Resizer and decide which is most suitable for you.
Compare XnConvert and FastStone Photo Resizer and decide which is most suitable for you.
Compare GraphicsMagick and FastStone Photo Resizer and decide which is most suitable for you.