HTTPS Everywhere - Chrome extension that encrypts and secures your browser
Digicert - Encryption & Authentication
Smart HTTPS - Automatically changes HTTP addresses to the secure HTTPS, and if loading encounters error, reverts...
Let's Encrypt - Let’s Encrypt is a free, automated, and open certificate authority brought to you by the Internet Security Research Group (ISRG).
SSL Enforcer - SSL Enforcer - Force SSL/TLS encryption for any browser or app. Block all unsecure connections.
SSL For Free - Free SSL Certificate issued in less than a minute.