Fastmover

<p>A simple drop down selection meta box on a post edit page will allow you to specify default, HTTP or HTTPS.  Default will allow both HTTP and HTTPS protocols.</p>


Protocol Enforcer

This plugin allows a user to specify a post to only be viewed over HTTP or HTTPS.

David Garcia

<p>With the rise of secure websites we need an easy way of replacing all the http links with its secured version. With this plugin you only have to install and activate it and it replaces all the protocols on-the-fly. It doesn’t modify the database or theme contents in any way. This plugin tries to facilitate the transition from an unsecure site to a secure version of the site.</p>


Force Protocol-less Links

This plugin modify the protocol of all links by its protocol-less counterparts.

Protocol Enforcer vs Force Protocol-less Links