I recently published my side project connected with BCI and EEG technology in Google Play Store. 
EEG Analyzer reads electrical activity of the brain with EEG technology and blink strength with EMG sensor from NeuroSky MindWave Mobile device connected via Bluetooth to Android device. In order to use this application, you need to have NeuroSky MindWave Mobile device, which can be ordered from http://neurosky.com/ website. Direct link to the mentioned product: http://store.neurosky.com/products/brainwave-starter-kit Application has the following features:
- Reading attention level
- Reading meditation level
- Reading blink strength
- Reading brain waves
- Reading raw signal
- Drawing plots of attention level change in time
- Drawing plots of meditation level change in time
- Saving attention level, meditation level and blink strength change history
- Exporting saved signal to Dropbox servers in *.csv format
- Possibility to turn on voice feedback informing about high attention or meditation level
Application is available in English and Polish language version.
Update
EEG Analyzer was featured on official NeuroSky Store at: http://store.neurosky.com/products/eeg-analyzer.