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.

lucasstad

<p>Lucas String Replace replaces any string on any WordPress processed page with another string.<br />
It takes the final output of WordPress and replaces defined strings with another string.</p>
<p><strong>New:</strong> Add multiple strings to replace and create mutltiple sets</p>
<h4>You can use it, for example, for the following purposes</h4>
<ul>
<li>HTTPS Protocol Rewriting (replace any “http://domain.com” with “https://domain.com”)</li>
<li>Better WordPress (Multisite) Domain Mapping (replace any “myblog.domain.com” with “www.myblog.com”)</li>
<li>Replace or add HTML to a specific place</li>
<li>Make changes or add contents to your sitemap.xml (non-static, tested with XML Sitemap Generator) or to your robots.txt</li>
<li>Repace or change anything made out of letters and numbers…</li>
</ul>
<h4>Please note</h4>
<ul>
<li>Lucas String Replace can slow down your website speed. It is recommended to use it in combination with a caching plugin to keep your website fast.</li>
</ul>


Lucas String Replace

Does what "Say what?" does not do: change widget titles too

Pretty neat

Change anything: Lucas String Replace takes the final output of WordPress and replaces the defined strings with another string

Protocol Enforcer vs Lucas String Replace