To help contribute back to the community, we're going to try to develop and give away one new widget per month.
For January we have developed the "Related List" widget, which allows you to display related lists on the form page in Service Portal.
Example below from a service catalog request:
To download the widget, it's available on ServicePortal.io: Free Widget of the Month - ServicePortal.io - Service Portal, CMS, and Custom Apps
