We are glad to see our IIIF Viewer applied on various websites. IIIF Viewer is an Open-Source component brought by Klokan Technologies. IIIF Viewer is optimized for desktop and mobile devices (iOS, Android), is open-source, free to use and has, compared to other viewers, the following extra features:

• Rotation on the client side: pinch with fingers, alt-shift drag with the mouse.
• Drawing tools: polygons, lines, markers — can be used to annotate parts of the pictures.
• Colour adjustment: saturation, lightness

The code is available on GitHub.

See examples of usage.

An excellent example is the Maps of Scotland from the National Library of Scotland.