This is Cardinal Path's version of the Google Spreadsheet for creating and keeping track of campaign URLs. It uses Google Apps Scripts to correctly apply the tags to the url no matter if it contains other query parameters or anchor tags.

It support link minification on the fly using bit.ly or goo.gl services. You can select the one that best suits you from the preferences panel.

It's a great tool if multiple people on your team need to create campaign urls collaboratively.

This tool is provided free of charge as a Google Spreadsheet template. You just need to create a new document based on this template that is also available through the Google Docs template gallery.