HTTPS Everywhere - Chrome extension that encrypts and secures your browser

Seald - Keep your conversations secure, everywhere.

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.

Spike - Spike solves businesses' communication chaos by bringing together email, team chat, collaborative docs, and meetings, into one feed.