Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
BuzzTalk - BuzzTalk is Indian vernacular smart instant messenger
MyChat - Secure instant messenger for any network
Ubiq Security - Enable developers to build encryption into apps in minutes
OfficeChat - OfficeChat is a secure messaging app to share rich messages, documents, pictures, videos and location with their colleagues.
Keybase for Mobile - End-to-end encryption messaging platform