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

David Gregg

CCS-HTTPS is a simple plugin that allows you to identify which pages should have HTTPS enforced. All other pages will have HTTP enforced. 
This plug-in will not interfere with or override any of the built-in WordPress options related to forcing HTTPS for the login and admin pages.

CCS-HTTPS

A simple plugin that allows you to identify which pages should have HTTPS enforced. All other pages will have HTTP enforced.

Force non-SSL vs CCS-HTTPS