Ian Dunn

Redirects all HTTPS traffic to HTTP, except for specific exceptions. You might want to do this to minimize the number of times users would see an error if you don’t have a valid SSL certificate setup, or if you want to make sure that the delay SSL adds is only experienced when necessary.

Force non-SSL

Redirects all HTTPS traffic to HTTP, except for specific exceptions

mohanjith

Code Master

Helps you make the site available via https and http with no effort. Just install and activate 
and say good bye to SSL errors without forcing users to access via http or https only.
<h3>Notes & Credits</h3>
This plugin is written by <a href="http://mohanjith.com/" rel="nofollow ugc">S H Mohanjith</a>.
You should follow us on Twitter <a href="http://twitter.com/codemasteroy" rel="nofollow ugc">here</a>.

WordPress SSL

Have been using this plugin to resolve SSL errors for quite a while.  Has not failed and works just as advertised.  Ensures all links to resources are on the correct protocol.

Has worked well for a long period

Seamlessly map URLs to SSL if the site is accessed via SSL.

Force non-SSL vs WordPress SSL