Ways to mantain concentration on spells

[Uncle Pine]

Are there ways in PF to mantain concentration on a spell other than doing it yourself? I know of a couple of ways to do it in 3.5 (Sonorous Hum, Swift Concentration, Familiar Concentration), but not in PF.

[Uncle Pine]

*bump*

I actually did find something on the pfsrd, namely Effortless Trickery (http://www.d20pfsrd.com/feats/general-feats/effortless-trickery) and Familiar Concentration (http://www.d20pfsrd.com/feats/3rd-party-feats/kobold-press/general-feats---3rd-party---kobold-press/familiar-concentration), but the former is limited to Gnomes and Illusion spells, while the latter is 3rd party. Is there anything else at all?

[Psyren]

Bards/Skalds have Spellsong (http://www.d20pfsrd.com/feats/general-feats/spellsong). That's all that comes to mind unfortunately.

[Hazrond]

Illusion focused wizards are able to take the School Familiar feat for illusion to give their familiars the School Familiar Archetype (http://www.d20pfsrd.com/classes/core-classes/wizard/familiar/familiar-archetypes/school-familiar-familiar-archetype) so that they can mantain your illusions for you

[Hiro Quester]

The third party feat Familiar concentration (http://www.d20pfsrd.com/feats/3rd-party-feats/kobold-press/general-feats---3rd-party---kobold-press/familiar-concentration) let's your familiar do the concentrating for you.

[Uncle Pine]

Well, it's not much but at least is something. Thanks to all of you!

EDIT: In case you're curious, this was for a Conjurer Elf character.