JPEGmini is described as 'Patent-pending photo recompression technology, which significantly reduces the size of photographs without affecting their perceptual quality. The technology works in the domain of baseline JPEG, resulting in files that are fully compatible with any browser, photo' and is a Image Optimizer in the file management category. There are more than 50 alternatives to JPEGmini for a variety of platforms, including Web-based, Windows, Mac, Linux and Wordpress apps. The best JPEGmini alternative is Caesium Image Compressor, which is both free and Open Source. Other great apps like JPEGmini are ImageOptim, Dinky, TinyFast and OptiImage.
This tool is really quite close to JPEGMini, from the quality and even sometimes surpasses its quality of compression and file size immensely! I combine this one with Riot and FileOptimizer, namely Riot?Pingo?FileOptimizer and achieve extreme compression! You can also use JPEGMini with FileOptimizer and use Exifcleaner and recursively compress a few times in iterations!