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>This replacement fixes mixed content warning that occurs when moving a blog to https without replacing current http style links.</p>


Double Slash Domains

This plugin removes the http/https schema from urls inside the blog source code and replace them with double slash.

Protocol Enforcer vs Double Slash Domains