shawfactor

This plugin does tracking/grabbing properly by tracking the data by localstorage only, rather than cookies or session variables. This is a superior way of tracking this data as it does not impact your server or break caching in any way.
It does so by including the Bill Franklins fantastic lightweight JavaScript library for this. I will be including thiis data automatically in my own plugins. But you can access intrsuctions and examples on how access this data in your own opt in forms here:
https://github.com/bilbof/purser

LH UTM Tracking

The proper way to capture UTMs on your (optin) forms.

MovieGrabber

A great plugin to you. If you want to open a movie website, you can have a movie website with a quality information pool from two different sources and imdb. Try it now!

Movie Grabber

Great

A great plugin to you. If you want to open a movie website, you can have a movie website with a quality information pool from two different sources an …

LH UTM Tracking vs Movie Grabber