HTTPS Everywhere - Chrome extension that encrypts and secures your browser
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Smart HTTPS - Automatically changes HTTP addresses to the secure HTTPS, and if loading encounters error, reverts...
MyChat - Secure instant messenger for any network
HTTPZ - HTTPZ is meant to be unobtrusive and lightweight.
Ubiq Security - Enable developers to build encryption into apps in minutes