noUiSlider
JavaScript range slider with multi-touch and keyboard support
...It supports non-linear ranges, requires no external dependencies, has keyboard support, and it works great in responsive designs. Have you tried this documentation on your phone? It can be used for free and without any attribution, in any personal or commercial project. An extensive documentation, including examples, options and configuration details, is available in the website. GPU animated, no reflows, so fast; even on older devices. All modern browsers and IE > 9 are supported.