TestInsight
This IDE plugin written by Stefan Glienke adds an IDE panel which is a sort of GUI test runner for DUnit or DUnitX unit tests. It can run thise tests in paralell to the IDE, so one can continue editing code while unit tests run and it can be set up to run them periodically or evdery time one saves the currently edited file.
This leads to running the unit tests more often and thus quicker cycles for detecting regresstions created by code modifications.
This tool is open source and installed by a "classic" setup.exe type installer.
The installer can be found here: https://files.spring4d.com/TestInsight/latest/TestInsightSetup.zip