Guest Ignore
Guest Ignore allows you to set guests on your server (using permissions) who are to be ignored from mobs. This is useful if you want mobs to roam your server, but you don't want to have to worry about new users joining only to creeper bomb your server. This is a very simple a lightweight plugin that only does one thing. It makes it so that mobs cannot see guests.
Permissions
If you want a rank to be ignored by mobs, simply add guestignore.ignore to their permissions and you are done!
There really isn't much to this plugin. As it only does one thing. I just created it because I've noticed some users who were requesting a plugin like this, but they couldn't find one.