Website Grader - Grade your website's strengths and weaknesses in seconds.
Squash 2 for Mac - The easiest way to compress and optimize images for the web
PageSpeed Ninja - One-click page speed boost for WordPress
Resizing.app - Image resizing has never been so simple with free online resizing.app. Convert, optimize, resize images with ease and for absolutely free.
WebSite Auditor - The techie's SEO spider: find site issues other tools miss
Image Resizer for Windows - Lets you resize images by right-clicking.