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Flock

Real-time team messenger tool

Flock provides channels where multiple users on the channel can brainstorm/chat on any particular idea or project. It comes with a set of inbuilt productivity tools, one of them is the polling app - that'll help you consider everyone's opinion when taking a decision. It's also a cross-platform app, available across Mac, Windows, Android, Iphone and Chrome. There's ton of features for collaboration. Also, did I mention it's free?
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