David Garcia

This replacement fixes mixed content warning that occurs when moving a blog to https without replacing current http style links.

Double Slash Domains

This plugin removes the http/https schema from urls inside the blog source code and replace them with double slash.

Frank

SSL Fixer makes a few changes to the database in order to fix any insecure links. Effectively fixing the HTTPS redirection and mixed content problems in one click. Precisely speaking it does two things:
<ul>
<li>Modify any insecure links from your wp-config.php file, such as WP_DEFINE() home and siteurl.</li>
<li>Convert all your database’s HTTP links into HTTPS ones, making the requests secure.</li>
</ul>
To make these changes, all you need to do is click the plugin’s “Fix SSL” button.

SSL Fixer

SSL Fixer makes a few changes to the database in order to fix any insecure links. Effectively fixing the HTTPS redirection and mixed content problems  …

Double Slash Domains vs SSL Fixer