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Constant contact sign up form for custom site

Hi have a custom site and I'm looking for a cool way for people to sign up to my newsletter.  I want a fly-in or pop out email sign-up.  I use constant contact for emailing.  I see lots of plugins like this for Wordpress but can I find a cool script somewhere for a custom site?
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Top Expert 2015

There is nothing cool about popups in sites.
You can publish RSS feed and people can subscribe/unsubscribe at will.
Most Valuable Expert 2011
Top Expert 2016
CC has an API and robust developer tool sets.  But getting people to sign up for email newsletters is not about getting then to visit your web site (that was a thing in 2005, but those days are long gone).  Signups take place across all media today and CC has excellent guidance on the subject.

They also have a public API (open source).

And they host a signup sheet of their own, visible on most of their web pages.  If it were my task, I would emulate what they do -- they are experts in the business!