Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...

Face++ - API for face detection – also detects gender, age, pose

Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.

Facesoft - The world's most accurate face recognition algorithm

TextMe - TextMe is a free calls and messaging application at both local and international levels.

Facial Recognition by FB - Get notified if someone tries to use your photo on Facebook