Smartervate is my 3rd addon and it’s probably the first that has a real function in a raid environment
It’s an addon for healers who occasionally require assistance with Mana. This could be either you’re undergeared and going oom or you died in combat and took a brez. It is also likely to be useful in hard modes or when a healer is offline/dead etc and you need to cover more heals for the raid
http://www.wowinterface.com/downloads/info16602-Smartervate.html
The addon will on user triggering it, whisper a druid requesting their innervate in a logical way to automate the process. No need to manually whisper someone mid fight only to find out Innervate is on CD or you’re on their ignore list haha.

General Options
Use oRA3 – Listen for oRA3 Messages to know who has used their Innervate.
Whisper Options
Whisper Out of Combat – this should generally be disabled (unticked) so when you’re ooc you do not bug anyone 
Whisper Lock Time – as you whisper a druid they are ‘locked’ for this period of time so you can whisper the next suitable druid. This means you dont just spam the same druid over and over even if they are ignoring u ![]()
Message – personalise the message to chosen druid
Additional Options
Mana Theshold Percentant – no message will be sent unless you are over that threshhold (50% is a good number I guess because this is generally when I’m hitting my Innervate with the reduced cooldown).
Druids – Enter the druids you wish to prioritise or use the button provided to populate them and then prioritise.
Load Group/Raid Druids – Get a list of druids from group and raid. Once done prioritise them (usually dps kitties > tanks > owls for example).
Create Macro – This is for druids, will create a macro to trigger smartervate and cast innervate (if its off CD).
USAGE
create a macro with /smv in it (I use my Innervate macro) and when you are low on mana hit it and it will;
1. Check your mana level against threshold (if your ok it will halt)
2. If you’re a druid check if your own innervate is available (if your innervate is available it will halt)
3. Go through druid list and find one who doesnt have innervate on CD or isnt in the Whisper lock list.
4. Send whisper based on message.
It’s pretty easy 

Seems like an addon best used by arcane mages.