Wire's Raidkiller
Category: Raid
Wire's Raidkiller is great addon that will make your raiding life much easier. It features timers for key boss abilities and warnings that will alert you when you need to do something. Supports all 10 man/20 man raid content and some 5 man content (mostly Caduceus Rise)
Download:
http://riftui.com/downloads/info80-WiresRaidKiller.html
King Moss Mods
Category: Raid
Originally an addon designed specifically for King Molinar & Prince Dollin fight in HK, this addon has evolved to perform similar functions as Wire's Raidkiller but it does two things exceptionally well.
Download:
http://riftui.com/downloads/info48-KingBossMods.html
Herald's Buff Warden
Category: Buff Tracker
It shows all the buffs available for your soul combination and allow you to apply them by clicking on them and display a timer on how long they will last. It also works for potions, food and consumables like powerstones! You no longer need those buffs taking up your hotbars!!
Download:
www.curse.com/addons/rift/buff-warden
Karuulalert
Category: Buffs/Debuffs Tracker
Karuulalert is a buff/debuff tracker that can alert you if you have a buff or debuff on you via displaying an icon on your screen. It is very useful if you want to track if you have a proc (i.e. Serendipity for clerics) or debuff (i.e. healing debuffs in PvP).
Setting Guide:
Healing Debuffs, PvP and Debuff Addon Settings
Download:
http://riftui.com/downloads/info84-KaruulAlert.html
nKRebuff
Category: Buffs/Debuffs Tracker
nkRebuff is an addon similar to Karuulalert. The only limitations is that it sets to only recognize your own buffs/debuffs by default. This does limit its usefulness but it is less CPU intensive. So if Karuulalert stress your computer out or not working well for you, then look for this alternative.
It is also designed to use for rogues, so other archtypes may not benefit as much.
Download:
http://riftui.com/downloads/info74-nkRebuff.html
nKAdvisor
Category: In-game Item Viewer
nKAdvisor is a very useful addon that allow you to view all items of level 50. It has two useful main functions - seeing what items drop and looking an item up and comparing it to your current item.
Download:
http://riftui.com/downloads/fileinfo.php?id=121&so=#info
SimpleMeter
Category: DPS Meter
SimpleMeter is an ingame DPS parser. It is an alternative to running an external parser like ACT. It can show everyone's parse, the top 5, or just yourself. It also give you a break down of everyone's parse (i.e. % of damage done by each ability).
Download:
http://www.riftui.com/downloads/info58-SimpleMeter.html
Target Casting Bar
Category: Casting bar/Raiding
This is an external cast bar you can resize and move around all over the screen. It has two features that are really useful. One of them is the ability to lock on that target and watch that target's casting bar while be targeted to something else. This is really nice in raiding/grouping situations as you can see exactly when the boss is casting something without having it targeted at all. The other nice feature is watch your target's casting bar, which is fairly standard.
Download:
http://www.riftui.com/downloads/info63-TargetCastingBarTCB.html
Castbar Replacement
Category: Casting Bar
This addon simply watch your own castbar as well. I don't find it too useful the default casting bar is good enough for me but if you don't like it try this out!
Download:
http://www.riftui.com/downloads/info68-CastbarReplacementCBR.html
bCast - Cast Bars
Category: Casting Bar
If you dislike the default cast bars for yourself, target, target of target etc.. then check out this addon. It has a lot of configuration options to make it look nice and pretty!
Download:
http://www.riftui.com/downloads/info133-bCast-Castbars.html
Archimedes
Category: Health/Mana bars
This is a fairly neat addon. Instead of showing your hp/mana/energy bars as rectangles, it shows them as arcs around your character, allowing to be more aware of them. This is really helpful if you are tunnel visioned like me sometimes and forget to check on your mana/health in the middle of a heretic fight.
Download:
http://www.riftui.com/downloads/info100-Archimedes.html
Startip
Category: Tooltip
Startip replace's Rift's default tooltip (the box you get when you hover over someone) and give it a bit more information. However, this addon use a lot of CPU activity and my game stuttered a bit when I was running this addon and hovering over things.
Download:
http://www.riftui.com/downloads/info44-StarTip-Rift.html
Runecraft Helper
Category: Crafting/General Info
You do not have to be a crafter to benefit from this! It is a great addon showing all the runes/potions in the game for easy reference. You no longer need to ask people what runes you can use in so and so slot or what potions are out there. Everything has being compiled for you for easy access.
Download:
http://www.riftui.com/downloads/info101-RunecraftHelper.html#info
Break Mover
Category: Crafting
Very handy for crafter that need to break large number of items (i.e. Runebreak, Salvage items). It is handy for professional crafters!
Download:
http://www.riftui.com/downloads/info101-RunecraftHelper.html#info
Book of the Fallen
Category: PvP
This is a nice little addon for PvPers who wish to keep track of their kills. I think the picture below will describe it better than I can!
Download:
http://www.riftui.com/downloads/info131-BookOfTheFallen.html#info
Puzzle Map
Category: Puzzles/Cairns
I thought this is a neat little addon that shows you all the puzzles/cairns on your map. It is not updated for Ember Isle though.
Download:
www.curse.com/addons/rift/puzzle-map
For more details of each addon:
Popular Addons for RIFT - Patch 1.6.1 Edition