Is there a good example of an MVC framework in practice? [closed]

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I have read hundreds of articles on models, and how they are used in the MVC framework. However, I've had a hard time finding a good example of one being used in the wild.

I feel like seeing something that goes beyond the limits of a tutorial would help me understand the end goal.

Do you know of any open source - and fully functioning - frameworks that I could check out as examples?

NOTE - I'm not looking for simply CodeIgniter - unless it's a site or app that was based on CodeIgniter and therefore has stuff that I didn't download with the CI framework itself.

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Magento is an open source ecommerce system build upon the Zend Framework.