Batch Image Processing Using GIMP

I've previously enlisted few tools regarding batch image resizing in windows. However they are limited to windows only and I was searching for something which was cross-platform. With some search, I found that GIMP loaded with David's Batch Processor would let us resize the images easily.

DBP (David's Batch Processor) is a simple batch processing plugin for the Gimp - it allows the user to automatically perform operations (such as resize) on a collection of image files. Its main advantage is that the user does not have to learn a scripting language. Like the Gimp itself, DBP relies on a graphical interface. The user creates a list of images, and sets up the processing required for each image. The results of the current settings can be displayed. Once the required sequence of operations has been set up, DBP performs the same processing on each image in turn. The images can be colour corrected, resized, cropped, and sharpened, then renamed and saved to a different file in a specified image format.

Check official website for more information on installation and downloads.