The Hammer
From DataFlex Wiki
The Hammer is an open source code editor for DataFlex and is a project from VDF-Guidance
Currently (November 2017) revision 3.0 beta is under development.
See also http://vdf-guidance.com/The_Hammer.asp?Page=THEHAMMER for earlier versions and the project page over at the VDF-Guidance project server for the current releases: