Username is the new WordPress plugin that simply allows you to change username, if username is not exist and without effecting others user’s username.
zM Ajax Login & Register, is new WordPress plugin with which you can easily create a custom login and registration forms and display them using the shortcodes
[ajax_register] or you can use modal boxes in the “Advanced Usage” settings. Install and activate it, after activation visit Dashboard -> Settings -> AJAX Login & Register page and select your options.
Instantly check your brand username availability over 575 popular social networks, 150+ domain names, and the entire USPTO Trademark Database.
Gplus.To allows you to create short URL for your Google+ profile like Facebook