HTTPS Everywhere - Chrome extension that encrypts and secures your browser
Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.
Smart HTTPS - Automatically changes HTTP addresses to the secure HTTPS, and if loading encounters error, reverts...
Keybase Chat - End-to-end encrypted chat built into Keybase
HTTPZ - HTTPZ is meant to be unobtrusive and lightweight.
Crypho - End-to-end-encrypted messaging and file sharing