ReaConverter is described as 'is time-saving batch image converter software that supports more than 400 source formats and over 60 output formats' and is an app in the Photos & Graphics category. There are more than 25 alternatives to ReaConverter for a variety of platforms, including Windows, Mac, Online / Web-based, Linux and Android. The best alternative is Caesium Image Compressor, which is both free and Open Source. Other great apps like ReaConverter are XnConvert (Free Personal), Phatch (Free, Open Source), Filestar (Free Personal) and Bulk Resize Photos (Free).
Online Image Converter converts your BMP, JPG, PNG, GIF or ICO files quickly and easily. It is completely free. Note that your image must not exceed 700Kb in size. If your image is larger, use Total Image Converter.
ImBatch is a batch image processor with a nice graphical user interface. It will allow you to edit multiple image files at the click of a button by using scripts. The script will be created by combining Tasks.
A powerful photo manipulation program for Windows and Mac that makes it easy to add date/time stamps, resize, convert, watermark, touch-up, apply special effects, and rename hundreds of photos in a single operation!.
Photo Batch will help you process all your images at once. No more repetitive work, simply drag the images or the folders you wish to process into Photo Batch, then apply the desired effects, crop, rotate, resize and rename them all and finally export them.