Fastmover

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.

Protocol Enforcer

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

phikai

Forces your entire site to ALWAYS use HTTPS
Please help by reporting any bugs/feature request at the link below.
Bugs:
<ul>
<li>Report at: <a href="https://github.com/phikai/wordpress-force-https/issues" rel="nofollow ugc">Github Issue Tracker</a></li>
</ul>
Questions/Comments:
<ul>
<li>http://www.kaiarmstrong.com/contact/</li>
</ul>

WordPress Force HTTPS

Forces your entire site to ALWAYS use HTTPS

Protocol Enforcer vs WordPress Force HTTPS