SISTRIX - SISTRIX toolbox is an SEO tool for professionals helping reputable companies to constantly improve their websites.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Page Weight - Find and fix heavy images on your website
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
PageSpeed Ninja - One-click page speed boost for WordPress
Ralpha Image Resizer - High-speed image batch conversion tool