Flotr is the replacement of Solutoire Plotr which is a javascript plotting library based on the Prototype Javascript Framework and inspired by Flot. Flotr enables you to draw appealing graphs in most modern browsers with an easy to learn syntax. It comes with great features like legend support, negative value support, mouse tracking, selection support, zoom support, event hooks, CSS styling support and much more.

Requirements:Prototype 1.6.0.2+, excanvas.js (included in the Flotr zip file)
Demo: http://solutoire.com/flotr/docs/
License: MIT License