Advanced Combat Tracker in short ACT is an encounter parser for EverQuest2. Its goal is to provide you with data for nearly every aspect of the battle. You can see everybody's DPS, heals, cures, etc...
Another feature of ACT are "Triggers". You can create audible warnings with the text-to-speech engine which trigger on keywords from your chat-log. So you can eg. joust from an AOE that you might otherwise easily miss in the midst of battle.
RANGER - tells you when you see a weakness in your enemy:
<Trigger R="can see a weakness in your enemy" SD="EXPLOIT" ST="3" CR="F" C="Ranger" T="F" TN="" Ta="F" />
MONK: tells you when you created a combo (nice to learn and figure out combinations):
<Trigger R="YOUR Combination" SD="comb" ST="3" CR="F" C="Monk" T="F" TN="MonkCombo" Ta="F" />
Website and Download (it's free): Advanced Combat Tracker website