WeakAuras
World of Warcraft addon that provides a powerful framework
...An intuitive and powerful configuration interface. Custom textures including all textures from Power Auras and Blizzard's spell alerts. Progress bars and textures that show the exact duration of auras. Displays based on auras, health, power (mana, rage, soul shards, holy power, etc.), cooldowns, combat events, runes, totems, items, and many other triggers. Preset and user-defined animations. Custom side-effects such as chat announcements or sounds. Grouping, which allows multiple displays to be positioned and configured at the same time. ...