When melee attacking a character that has parry, is there anything besides Vader's "Overwhelming Force", that negates a character from the ability to use parry? Thanks in advance.

Overwhelming Power (Damage from this character's attacks cannot be prevented or redirected)
Terentatek (Epic), Vong Firebreather and (Sith) Leviathan have it; plus the Rakghoul Warrior; and then Malakili grants it to Savages via CE.

There might be something else, but I can't think of anything at the moment.

Brutal Strike (Saba Sabatyne)
Lightwhip (Silri)

Jedi Battlemaster (S+V) also has brutal strike