I coded a custom a script that redirects all external links to an Anonymizer URL. The addon has the javascript file for vBulletin that redirects the links, and it also has the Anonym PHP script that actually redirects the LINK Anonymously.
You can use a different domain or subdomain, or you could just use another directory of your main domain.
This is how I have it setup on my server:
My main domain is:
https://thetechgenius.net
My Anonym Domain (where the addon is installed):
https://ttechg.link
So when a someone clicks an anonym link on my vB forum at
https://thetechgenius.net, the link will show like this:
https://ttechg.link/?http://vbulletin.org
Note: You can actually click that Anonym link, and it will Anonymously redirect to vBulletin.org. And as you can see, it works for SSL/HTTPS also. Anonym.to doesn't work for SSL, because the server doesn't have SSL enabled.
You host all the files on your own server, so you are in control. You dont have to worry about Anonym.to going down.
I will be releasing the full Addon very soon. I am just cleaning up the javascript, and working out a few bugs. This addon should also work with any website, or web software. Its just Javascript and PHP.