There are some settings on INDIWebManagerApp ("Start at System Startup", "Auto Launch Manager" and "Auto Hide ManagerApp") not adapted yet to work as expected on FreeBSD.
Besides, a dialog window appears some time after application is running, apparently after checking some settings, saying:
Please configure the INDI Web Manager. The Preferences Dialog will now open.
Python, Pip, and INDIWeb need to be installed and configured to use this program.
INDIWeb can be installed on Linux using the installer button in the Preferences Dialog, but python and pip must be installed from the command line.
This dialog appears even when the application is functional.