I'm searching for a mod which would allow me to track my managain after a fight, preferably something similar to what SWS is doing for damage and skills. I've been searching for quite a while, but I can't seem to find anything like this.
Well, this 'mod' does far far more than what you want, but it also includes all mana/rage/energy/health gains: http://www.lossendil.fr/serendipity/ (Wow Web Stats)
Cryect's version of Recap also includes 'Power Gains', which is basically anything which increases a person's mana, rage or energy which is listed in the combat log.
