imagezoom is a jQuery image magnifier plugin which allows you to enlarge part of an image with mouse interaction.
Minimal jQuery Image Magnifier Plugin - Mk Magnifier
Image Magnifying Glass Effect With jQuery and Canvas - Magnifier
Lightweight Image Inner Zoom Plugin with jQuery and Canvas - Image Zoomer
Minimal Circular Image Magnifier with jQuery and CSS3
Simple jQuery Image Magnifier & Enlargement Plugin - imagezoom
Easy Flexible jQuery Image Zoom Plugin - Sprite Zoom
jQuery Plugin For Customizable Image Magnifying Effect - Classy Loupe
Easy jQuery Image Inner Zoom Plugin - evenZoom
Minimalist Image Magnifying Effect With jQuery - zmagnifier.js
Responsive Image Magnifier & Inner Zoom Plugin - magnificent.js
Mobile-friendly jQuery Image Magnifier Plugin - imagezoom
Easy Product Image Magnification Plugin - jQuery EasyZoom
Touch-friendly Image Zoom Plugin For jQuery - Enlarge.js
eBay Inspired Magnify Image On Hover Plugin - jQuery Magnifier
Show Full Size Image On Hover - jQuery Image Magnifier
Simple Yet Versatile jQuery Image Magnifying Plugin - Zoomple
Stylish Magnifying Glass Plugin - SergeLand Image Zoomer