Well I was thinking, we have the guns, missiles, and Beam weapons.
Wouldn't pulse weapons be good also?
Energy pulses.
Now I am not sure how they would be advantageous, but I have a few ideas:
Either:
Far smaller, but all defences defend against it decently.
Far Ceaper, but all defences defend against it decently.
Easier to research, but all defences defend against it decently.
Maybe Have them be smaller, cheaper, but more effective against armour than guns, but effected by both shields and missile defences?
I don't know: So lets speculate and think about it!