Good Mod

[Ralvardar]

I have use a mod named Low Values Alert. It gives you a visual and audible alert when your HPs/Mana get to 50/25/10%. I really like it.

Link http://www.curse-gaming.com/en/wow/addons-819-1-low-values-alert.html

[Neirai the Forgiven]

Scrolling Combat Text already does that sort of thing :)