Voting extensions / solutions similar to voices here!

Hello guys,

i am searching from a whiiiiile for an extension similar to Voice used here for features suggestion !
I am looking for some thing very simple with two main feature :

> posting items by members with a categorization system
> vote / unvote on items

Actually i am thinking to use Trello as external solution but it seems that people can vote only.

any idea ? maybe the SI team can share Voices with public ?

thanks!