SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
Images go whoa with lots of floaty dots
BonsaiJS is a graphics library and renderer
jQuery plugin for 'responsive cropping'. Dynamically crop images to fill available space without cutting out the image's subject. Great for full-screen images.
Jcrop (official) - Image Cropping Plugin for jQuery
A simple jQuery image cropping plugin.
Img to Ascii