WP Jacker Pro
Sales Page: http://wpjacker.com/pro/
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"WP Jacker Pro - Legally “jack” any WordPress plugin by injecting email registration, building your list by giving away plugins!
WP Jacker allows you to inject your own email registration form into any WordPress plugin. All you need to do is copy and paste the email form HTML code from your service provider, such as Aweber or GetResponse, into the WP Jacker Pro plugin. If you are familiar with HTML, you can create any kind of form you like.
How it works:
Since ALL plugins in the WordPress plugin directory fall under the GPL license, you are free to use, modify, re-package, and even sell them. You can pretty much do whatever you like. Since many website owners don’t know what’s available to them, you can provide them the tools they need with free WordPress plugins and build a list in return for your knowledge. WordPress plugins cover just about any niche imaginable, so they can be an amazing foot-in-the-door to gaining clients and customers...!"