Another free tool gets wrapped up into a GP feature.
Microsoft Dynamics GP 2016 R2: Show user name in message when it is edited by another user
Microsoft Dynamics GP 2016 R2: Show user name in message when it is edited by another user – Microsoft Dynamics GP Community
Install, Upgrade & AdminGP 2016
Archived post from 2016. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.