SMS Plus - SMS Plus app offers features that let you forward text messages through internet connection as well as through other social media platforms.
Keybase Chat - End-to-end encrypted chat built into Keybase
Easy Message - Easy Message app comes up with features to help users in effortlessly sending text messages to a phone number, which is not in the contact list.
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Crypho - End-to-end-encrypted messaging and file sharing