ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
match.color.io - Automatically match colors of any image or movie with ML
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Image Colour Transfer - A free-to-use browser-based application that allows an image to be recoloured to match the colours of another image using novel methods.
Ralpha Image Resizer - High-speed image batch conversion tool
Color Palette Generator - Enter the URL of an image and find its color palette