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.

janiko

<p>This very simple plugin aims at avoiding mixed content when using https for wordpress sites.</p>
<h4>Principle</h4>
<p>When you are using HTTPS for browsing, all content resources will point to https. All ‘http’ references will be changed to ‘https’.</p>
<p>On the contrary, if you want HTTP browsing, all references will be changed to ‘http’, which can be useful if you are behind a proxy that filters https.</p>


Https Switcher

Thanks @janiko for creating this great plugin! It works fantastic on my sites and even your source code looks amazing. Well done!

Simple and yet powerful!

Force http/https for resources, depending on the scheme you use.

Protocol Enforcer vs Https Switcher