First post here so go easy on me. I've been working on this tool for my work over the last couple months & am really proud of it.
It's called AlgoSleuth. It harnesses the power of the Google Analytics API to provide a powerful analysis of your site’s organic traffic and highlights all major Google Algorithm updates that may have affected you over the past several years. The tool includes all major Panda and Penguin updates from January 2011 to today. The process for extracting your data takes, on average, just 2-3 minutes. After that, you can use AlgoSleuth to query results for one or any number of Google Analytics profiles.
You can get more details and download a copy to tinker with HERE.
If anyone has any feedback, comments, or questions I'll be more than happy to answer here or via PM. Thanks.