JPEG Wizard - Reduces JPEG/JPG file sizes with several optimizing options. You can also use it to rotate or mirror your images. Will work only with files from your hard drive. This free online service is designed to give you a taste of their software that you can download from their site.

LuraWave Smart Compress - LuraWave is a state-of-the-art file format that uses wavelet-based compression to reduce file sizes while achieving better image quality than conventional methods such as JPEG and TIFF.

WaveL CompressIt - WaveL CompressIt is a free image-compression utility that uses the new wavelet compression scheme. This method enables you to store an image at a very small size, and maintain the quality.

ProJPEG - ProJPEG Photoshop plugin consistently produces JPEG files that are routinely 50% smaller than Photoshop