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There is a Legacy version here.

PFS StandardEffortless Concentration [free-action] Feat 16

Bard Druid Sorcerer Summoner Witch Wizard 
Source Player Core pg. 106 2.0, Player Core 2 pg. 157 1.1
Trigger Your turn begins

You can maintain a spell with hardly a thought. You immediately gain the effects of the Sustain action, allowing you to extend the duration of one of your active spells.

Special This can only be used on a cantrip or spell from the class matching the one you gained this feat from.