I'm building a plugin for wordpress and joomla and plan to give it away for free. In return, is there a way I can get a backlink from each of the sites it gets installed and used?

I explored few options and someone at this same forum suggested adding the backlink in <noscript> tag. This thread was posted way back in 2007. Does this still hold good? Do Google and other search engines count the text in noscript as a backlink.
My plugin adds a decent feature to the websites by inserting js code on their sites.

Along with this js, I would like to add some code to get a backlink to my website without the knowledge of the plugin user.

Please suggest a right approach.

Thanks.