Change Frame Color & Texture
To change the frame colors to classcolors try StatusColor, to change the frame texture try StatusQuo both listed on the Art page.
Health Percentage
To add health percentage to the default unit frames try TargetPercent.
Move the Frames
To move the frames try some of the mods on the frame mods page or MovePlayerFrame or thek:UnitFrames.
BunchOfBars
BunchOfBars is a modular and lightweight bunch of party/raid unit frames.
Curse
Plugins - Curse
Dreagar's Text Unit Frames
Simple movable text unit frames.
WoWInterface
ExperienceJunkie
Adds a ring around the people in your party, displaying their experience, that also have ExpJunkie. Currently only shows the exp in a ring/bar format.
WoWInterface
gFrames
This is a UnitFrame replacement built upon the oUF framework, and comes bundled with both player, party and raid frames. There are 3 different layouts of player frames to choose from.
oUF and all supported plugins are embedded, so there is no need for any additional downloads. oUF: MovableFrames can be used to change the positions of all the frames.
WoWInterface
Kollektiv Unit Frames
KUnits is a simple unit frame addon based off Nurfed style unitframes. After I got tired of Nurfed breaking every patch I made my own. There are very few options. Type /kunits to see them all. Shift + Click a frame to move it. If you want to customize it you'll have to edit the xml file yourself. Enjoy!
Curse
LonnyTweaksUF
A tweak for the Blizzard unit frames. Hit Indicator - A handy numeric indicator for damage and healing done on the target/focus frame. Unit Health - Display the unit HP in points and percentage. Unit Icon - Show the unit class/type in an icon above the target/focus frame.
WoWInterface
Lunar Unit Frames
A unit frames replacement with the performance of an oUF layout with very easy to use, in-game configuration options. An advanced oUF layout with many features.
WoWInterface
oUF
Minimalistic frames that are very low memory. They will work fine if you install them but they have no in game setup. All changes need to be done in the Lua code including their location on the screen. To use this mod you will also need to download and install a layout.
Config: Lua
WoWInterface
Plugins/Layouts - Curse, Layouts, Plugins
For a text based layout try oUF_Hank.
PerlClassicUnitFrames
Perl Classic Unit Frames are a complete rewrite of the original mods by Perl. They replace the default Player, Pet, Target, Target of Target, Party, and Party Pet frames and add dedicated frames for many other units (Focus, Focus Target, Party Target, Target of Target of Target). It has been a high priority to maintain the look and feel or the original Perl mods while expanding functionality. The mod has been recoded for performance and is built around the Blizzard UI usage of events.
WoWInterface
PitBull4
PitBull is a Unit Frames addon that provides maximal customization and undergoes rigorous efficiency testing. It is created in a modular framework, which allows for mulitple authors to put their skills to work creating this great project. It has support for many different kinds of units: player, target, pet, pet's target, target of target, target of target of target, focus, focus' target, party, party pets, party targets, party pet targets, raid, raid pets, raid targets, main tanks, main tank targets, main assists, main assist targets, etc.
Curse, FAQ, Guide, Forum Thread
Sage UnitFrames
Sage is a minimalistic, lightweight unit frame replacement designed to require minimal configuration. If you're looking for a set of unit frames with giant 3D models, or frames that are infinitely configurable, then Sage is not for you. If you're looking for a set of functional frames that "just work", then welcome home.
WoWInterface
Shadowed UnitFrames
Supports the basic units: player, pet, party, partypet, focus, focustarget, target, tot, totot, raid. The main focus in this mod is simplistic configuration, while maintaining flexibility that 99% of users care about, while you can't set that you want the health bar exactly 3.14 pixels outside of the health bar, you have options that you actually care about such as bar ordering, total frame height, bar spacing. All configuration can be done on multiple units at once through the global configuration, so if you want to change the height on player/target/party only, then set height for tot/totot/focus/focustarget you can do that easily.
For the people who have to tweak every single option, you can enable advanced configuration which will show extra options. But, you do not need to do this by default, it's only for people who really want to tweak every single thing.
WoWInterface, Curse, Modules
SimpleUnitFrames
SimpleUnitFrames is an extension to the default WoW Unit Frames. Rather than a complete unitframe replacement, this addon adds further information and features to the existing frames and allows a greater degree of customization to enhance their usability.
Curse
SnowfallUnit
This addon is a unit frame modification (player, target, focus, party, arena, raid, and so forth). The purpose of the addon is to add critical missing functionality to the Blizzard unit frames and improve their readability. The addon modifies the Blizzard unit frames without totally replacing them.
WoWInterface
Stuf
Stuf is a replacement to StellarUF. Stuf has the same default layout and feel of StellarUF, but Stuf is highly customizable. Do not expect much since this mod's purpose is to replace the Blizzard's main unit frames, not other unit frame mods.
WoWInterface
Trav's Unit Frame Extensions
Tired of hovering over your target or your party members to see what their class is? Well, Trav's Unit Frame Extensions adds class icons to the Blizzard Unit Frames so you can see their class at a glance! It also adds level information to party member frames, can make health bars colored, can hide or show the resting and in-combat indicators, and do more!
WoWInterface
UnitFrameTweaks
Modify the default blizzard unit frames with these options: Class Specific Icons, Class Specific Portraits, Health Color Changing (Green to Red), Hit Indicators over the portrait.
WoWInterface
xPerl
A much enchanced version of Nymbia's Perl UnitFrames, and a complete replacement for Blizzard's default unit frames, including raid frames and raid tools, with many additions and improvements over the original Nymbia code.
Curse