WiFive

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Let the social be with you.

Launch WiFive application and immediately start chatting with those who is using it too within your Wi-Fi network. No Internet needed. Also, there is no need to set up a server. Simple, eh?

But of cause there are some conditions.

In order to receive messages your device should not ignore broadcast UPD packets (as long as I know some devices are doing it, for example HTC)

Your Wi-Fi network should not block UPD packets (as long as I know some network managers are doing it). But it's OK if you are creating Wi-Fi Spot yourself. Google it, it's pretty straightforward.

Also, be aware of some possible message loss.

Have fun with unlimited communication! :)