Excellent Analytics was created in 2009 and was the first Google Analytics addin/plugin for Microsoft Excel. It has been downloaded tens of thousands of times. It has been an open source project since day one.
Note that Google has deprecated client login, the method for login used by Excellent Analytics Open Source. If you’d like to continue to use Excellent Analytics, please contribute code to the open source project and update the authentication method.
Looking for alternatives to Excellent Analytics?
Supermetrics Data Grabber (read more about Supermetrics)
Google Analytics Spreadsheet Add-on for Google Spreadsheets