This tool was created with Objective-C, and uses Emotiv "Premium" SDK (for access to raw EEG data), and MetatoneOSC for OSC communication.
The code is available as open source: szymonkaliski/EEG2OSC/
For EEG data we used Emotiv EPOC and written a data transceiver which outputs OSC messages - it's open source and available for free: szymonkaliski/EEG2OSC.