Viktor Solovej

This is an add-on for the <a href="https://wordpress.org/extend/plugins/advanced-custom-fields/" rel="ugc">Advanced Custom Fields</a> WordPress plugin, that allows you to add a jQuery Range Slider field type. http://jqueryui.com/slider/
Read more here: https://github.com/viriava/acf-field-range

Advanced Custom Fields: Range Field

jQuery Range Slider field for Advanced Custom Fields

maxman1850

Want to add a range slider to your Gravityforms forms? This plugin adds a simpler range slider to the Gravityforms plugin, edit your slider by selecting a minimum or maximum value and select the desired steps.
The Slider field is available under ‘Advanced Fields’

Simple Range Slider for Gravityforms

Does what it says, future updates can make it a great one. 

Simple plugin

Adds a simple range slider to the Gravityforms plugin. Allows users to select a minimum, maximum and steps to the slider.

Advanced Custom Fields: Range Field vs Simple Range Slider for Gravityforms