Gimp - GNU Image Manipulation Program
October 3, 2014 · Public
BIMP is a graphical batch plugin to apply a set of GIMP manipulations on groups of images.
You can use predefined manipulations like resize, crop, flip, rotate, color correction, sharpen, watermark, format conversion, rename, but you can also select other installed plugins or script-fu and apply them to each image.
More at: http://registry.gimp.org/node/26259