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Another example

Shadowed Unit Frames

Jan 22, 2015 Release
SUF focuses on a simple configuration while maintaining the flexibility that most users will care about, preventing unnecessary bloating of the addon that sacrifices performance. While you aren't going to be able to set the health bar to be exactly 3.14 pixels outside of the unit frames, you can change options you actually care about such as bar height, ordering, frame height and so on. To speed up configuration, you can configure multiple units at the same time through the global...
Example 1

SimpleUnitFrames

Oct 15, 2014 Release
About 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. The v2.x.x series of SimpleUnitFrames involved a complete re-write of the code, however credits go to Rophy and xan for their original work on the v1.x.x series. All configuration for SimpleUnitFrames can be performed...
Example

TargetPercent

Feb 25, 2015 Release
Adds a health percentage to the Blizzard target, focus target & boss target frames. Movable with ALT-drag if you dislike the default positions.

VerticalCastBar

Apr 14, 2010 Planning
Changes a standard casting bar into a vertical adjustable casting bar.
WTFrames in (testing-)action

Who's tanking - frames

Oct 15, 2014 Release
oUF based! This addon is based on (embedded) oUF! version < 1.32: it requires you to install oUF (download from wowinterface.com). Sorry about this dependency, but it shouldn't be that critical. Summary Since oRA3 doesn't provide MT-Target Frames anymore, i decided to write this addon. The main goal is to display oRA3 sortable Maintank/Playertank target frames. Changes V 1.2. Add Font options (Font face + font size) V 1.32 oUF embedded! V 1.40 Add Grow upwards and Grow left V 1.50 Update for...
Main Frames

X-Perl UnitFrames

Oct 18, 2014 Inactive
Patch 6.0.3 compatibility and future of X-Perl Use latest alpha from WoWAce for using in Patch 6.0.3 http://www.wowace.com/addons/xperl/files/ May still has problems but for most cases it should be working(at least was tested on beta), if not, clearing old setting by killing(and backup) XPerlxxxxxxx.lua in the WTF directory of your WoW installlation and try again with fresh new default setting, thanks your patience. If still someone want to help Zeksie for he earns his donates from X-Perl...