The Qwt library contains GUI Components and utility classes which are primarily useful for programs with a technical background. Beside a 2D plot widget it provides scales, sliders, dials, compasses, thermometers, wheels and knobs to control or display values, arrays, or ranges of type double.
Qwt is distributed under the terms of the Qwt License, Version 1.0. The official project page is hosted at http://qwt.sourceforge.net/