Zenity - Zenity is a tool that allows you to display GTK dialog boxes in commandline and shell scripts.
PackageX Receive - PackageX Receive digitizes package-receiving operations and delivers world-class package management solutions.
Yad - Yad (yet another dialog) is a fork of Zenity with many improvements, such as custom buttons...
DelivApp - Software for managing online ordering, delivery and loyalty for multi-unit restaurants
Glade - Glade is a RAD tool to enable quick & easy development of user interfaces for the GTK+ toolkit...
AfterShip - AfterShip is the shipment tracking API for ecommerce businesses and marketplaces.