Litmus is a mana emergency monitor and a tool for both raidleaders and druids in general. It is heavily based upon eeMon and therefore shares its customizability.
If you are playing a druid you might've heard this before:
RL: "PriestA and PriestB are low on mana. Druids, innervate them!"
Druid1: "PriestA innervated."
Druid2: "Damn, he got innervated by me, too."
Druid3: "Why did you two do that? I already casted it on him seconds before the RL said he was low on mana..."
RLs are way to busy during raids to announce which druid has to innervate whom.
Raidgroups change way to often to set up rules for innervating that everyone can remember.
Druids most likely innervate a priest without checking if he already got innervated.
And they almost never check, if any other mana class would benefit from innervate, too.
This addon was created to help druids and raidleaders sort out these problems easily.
Litmus works like any ordinary emergency monitor - but instead of showing you the players in your group/raid having the least health, it'll display those with the least mana. It also displays their (classcolored) names, the amount of mana missing, the subgroups in the raid and an icon for those that are currently innervated.
You can configure Litmus via FuBar, if you have it installed. Litmus will automatically place its icon on your bar so that you can access all its functions with a right-click. If you do not use FuBar, you'll have to use the slash command
If you want to know more about Litmus, please take a look at the wiki page at wowace.com.
If you can help me with further localization for this addon, please contact me here or in this thread on the wowace forums.