There are two Editions of the DHTMLX products:
Standard Edition - is distributed under
GNU GPL v2, which means you
can download and use it in a GPL-licensed project for free. To use the Standard Edition
in a non-GPL/proprietary project, you need to buy a Commercial
or Enterprise license.
PRO Edition - includes some additional features and is distributed under Commercial and/or
Enterprise licenses. By purchasing a license, you get access to our customer
support system. Learn more about licensing details.
NOTE: The following DHTMLX components are available under the Free license: Toolbar, Accordion, ColorPicker, Slider, Ajax, Popup, Message, and Editor.
You can use them for free in commercial apps.