I'm new at my job and looking at the project, the previous developer who's not with the company anymore has used jqGrid. When I open the js file, I see this so we have version 5.2.0
I went to this site and the latest version is 5.3 http://www.trirand.com/blog/?page_id=6
But, looks like jqGrid is not free for commercial. Maybe ex-developer paid for it, not sure...but is jqGrid's 5.3 free?
* @license Guriddo jqGrid JS - v5.2.0 - 2016-11-21
* Copyright(c) 2008, Tony Tomov, firstname.lastname@example.org
* License: http://guriddo.net/?page_id=103334