Automated Quest Mods

Blitz

Blitz is a small addon which can automatically accept and deliver daily and repeatable quests: it allows the user to select which quests he wants to automate and by-passes all the gossip process for them, much alike the Auto Loot feature. Blitz does not come with a list of the repeatable and daily quests available ingame. Instead, it will build its database as you use it: repeatable quests are detected soon as you talk to the quest giver, dailies are detected when they get to your quest log.
Curse

QuickQuest

A quest automization add-on. Features: Automatically pick up any quest, Automatically deliver any quest, Automatically use items that start quests, Automatically skip gossip if there is just one option, Highlights reward worth most at vendor, Works with the auto-quest system presented in Cataclysm, Alt-click in questlog to share quest, Ctrl-click in questlog to abandon quest, Temporarily disable by holding down the shift key.
WoWInterface, Curse

Sick Of Clicking Dailies

Sick of Clicking Dailies is an addon designed to make picking up daily quests and turning them in easier and more streamlined when you quest in bulk. This addon simply skips though all the gossip text when interacting wtih the NPC giving the quest. It also can automatically select a quest reward for the ones that have them, you can always leave it on none and the dialouge will stop there.
Curse

Tracker Tweaks

MonkeyQuest

The MonkeyQuest AddOn for World of WarCraft displays quests and their objectives in a nice drag able frame in a very customizable way.
Curse

rObjectiveTrackerMover

Small mod to make the header of the QuestWatchFrame dragable. Lets you move the Blizzard QuestWatchFrame around.
WoWInterface

SorhaQuestLog

Allows the display of quests and achievements on the screen in an configurable way.
Curse

Who Framed Watcher Wabbit?

Allows the quest tracker to be moved, tracker will collapse in whichever direction it's anchored to, quest tracker remembers collapsed state, adjust the scale, adjust the font/font size/font flag(outline, etc.)/remove shadow, adjust the spacing between lines, give the quest tracker a background and/or border (border can be class-colored), optional support for rActionButtonStyler to skin quest item buttons. adds a tooltip for quests to display their objective text, allows you to minimize/maximize (toggle) the tracker via keybind, option to automatically collapse the tracker when entering an instance or during pet battles, shortcuts added to the collapse button (toggle Quest Log, Achievement Frame, addon's options), global or character specific profiles. The slash command is /wfww. You may also alt-click the tracker's collapse button to access the options..
WoWInterface

Misc Quest Mods

AutoEquipQuestItem

Adds a button to the quest completion interface which allows you to auto equip the selected quest Item after completion.
WoWInterface

AutoTurnIn

The AutoTurnIn addon can handle accepting and turning in completed quests and choosing rewards. It can decide which reward to select by specifying options and if no suitable item is offered, the highest value one may be looted. Afterwards, it can also equip the chosen reward. Complete automated quest acceptance and completion. May handle just daily quests or any others you find in your adventures..
WoWInterface, Curse

Classic Quest Log

Restores the old quest log with the familiar list of quests on the left and details on the right.
Curse, WoWInterface

Legacy Quest Log also restores the old quest log.
Curse, WoWInterface

Dugi Questing Essential

Dugi Questing Essential is an All-In-One addon for anything to do with questing & leveling. Every option in the list below can be disabled easily from the config menu.
TomTom Emulation, Gear Advisor Feature, World Map Tracking feature, Find Nearest feature, Watch Frame Border, Quest Complete Sound, Map Preview, Waypoint System with Taxi Feature, Map Coordinates, Remove Map Fog, Auto Quest Accept, Auto Sell Grey Items, Auto Quest Item Loot, Floating Quest Item Button.
Curse, WoWInterface

Levelland

Shows the level of quests on the quest log, quest watch, gossip window, world map and quest links.
Curse

LightHeaded

Displays quest comments from WoWHead in game. Using this mod is simple, if you use any default quest log mod, just open your quest log. The data will be loaded automatically, and quest details will be displayed for the selected quest.
WoWInterface

Player XP Bar

This addon adds a little XP Bar under your portrait. XP is shown in percentage, you see when you have rested XP (show "(+xxx)" in the bar) and the bar has the same colors as the original XP bar (purple for normal xp and blue for rested xp). When you rollover the bar, you see details about your XP and XP to go (numeric & percent values).
WoWInterface, Curse

Quecho

Quecho is a simple addon design with leveling duos in mind. It helps you keep track of your partner's quest progress. Both players must run Quecho for it to work. Players in your party not running Quecho will not be bothered with your quest info. Quecho provides a few basic features: Chatframe notifications when your partner accepts, turns in, or abandons a quest; A second "quest watch" frame that shows your partner's progress on curent quest objectives next to the default quest watch frame; Automatic exchange of "Quest item: 2/200" messages as quests are completed. There is no config, if enabled Quecho will send addon messages, and display any it receives. Messages have a 5 minute timeout, and are automatically removed after that expires.
github, WoWInterface, Curse

Quel'evel

Adds quest levels to your quest log, the quest tracker, and quest links in chat.
WoWInterface, Curse, github

QuestGuru

QuestGuru is a Quest Log replacement that includes a Quest History, showing all quests that have been completed since installing QuestGuru. It uses a side-by-side quest log format to show you more quest titles than the built-in quest log.
WoWInterface, Curse

QuestPlates

Adds to mob nameplates the number of mobs you still need to kill/loot or will have a question mark if there's some other objective.
WoWInterface, Curse

VendorBait

When turning in a quest which gives a “select your reward” section, the item with the highest value is highlighted.
github

Work_Complete

Quest Progress messaging and sound. Plays "Ready to Work" and "Work Complete" audio messages. Additionally, it will send the quest status to party chat if you are in a group.
Curse

XPBarNone

Lightweight XP bar with a nice set of features. You can easily switch the bar to watch factions.
Curse