HTTPS Everywhere - Chrome extension that encrypts and secures your browser
SSL Enforcer - SSL Enforcer - Force SSL/TLS encryption for any browser or app. Block all unsecure connections.
Smart HTTPS - Automatically changes HTTP addresses to the secure HTTPS, and if loading encounters error, reverts...
ForceHTTPS - As wireless networks proliferate, web browsers operate in an increasingly hostile network...
HTTPZ - HTTPZ is meant to be unobtrusive and lightweight.
HTTPS Only - Encrypt the web and stay safe