we use
OMEN (Omen is a threat meter. Basically, enemies in WoW decide who to attack by deciding who is the most threatening based on the abilities you use. What Omen attempts to do is provide reasonably accurate estimates of your group's relative threat level on individual enemies, so that you can see when you're in danger of pulling aggro)
http://wow.curse.com/downloads/details/9101/
GROUP CALENDAR (Group Calendar allows guilds or groups of friends to share an in-game event calendar. The guild can post raid events and members can post events for dungeons they need to do quests for. Additionally, players can provide feedback to the event's sponsor saying that they will or won't be attending an event)
http://wow.curse.com/downloads/details/1958/
DEADLY BOSS MODS (Figuring out boss strategies is very exciting, but with how dynamic World of Warcraft's content is, that's only half the battle. Deadly Boss Mods makes the other half of that a walk in the park, thanks to a wide array of data hand-entered by the authors, that will display boss ability cooldowns, warnings for specific abilities, and a lot more)
http://wow.curse.com/downloads/details/4940/
Recount (Preservation) -- Knowing your performance (and others!) in terms of damage, healing, damage taken, healing taken etc is nice. Recount helps you with this. Locate the slackers and note the people that bring their A-game. Great for many things.
http://www.curse.com/downloads/details/10598/
