OpenIntents

PeerDeviceNet is both app and middleware to connect android phones and tablets securely thru Wi-Fi network. As an app, it allows a group of devices share web pages, contact information, pictures, videos and other documentations. As middleware, it helps developing connected mobile apps. You can reuse PeerDeviceNet connection manager to connect mobile devices for connected mobile apps or multi-player games. Via PeerDeviceNet apps can send messages to peer devices using intents, messenger or idl interfaces.
Support Android version 2.2 and up.

http://www.peerdevicenet.net