Is there any Looking for Group tool in Guild Wars 2? I'm trying to do a dungeon, but I can't find a party to complete it.
There is currently no tool in-game with a Looking for Group feature.
Alternatively, you may also change your "Status" to "Looking For Group" (Which applies a Blue Magnifier to the right of your character name). This is great for Dungeon Doors, where you may "say" without typing that you are open for a party invite.
As soon as you join a party, your status is switched back to the previous one.