It would be nice run a command at end of generation. The user can play a sound, display a pop-up window, etc.
You can currently use fet-cl if you need such a feature. Just write a skript or batch file. So add fet-cl first and the a command that you prefer as second.
Currently, FET plays a system beep (unfortunately not audible on some GNU/Linux systems) at the end of a single/multiple generation. I added your suggestion in the TODO.
I made your command-line notification suggestion. Please see asap the latest snapshot and let me know if it is OK. I intend to release in about 2-3 days, I hope.
Thank you for the suggestion.
https://lalescu.ro/liviu/fet/download/test/ , or see the Snapshots announcement topic.