Eliyo I designed on Laravel which I am still satisfied with. I initially started with Laravel 4 which was fairly new at the time. But now it's on Laravel 5. That update was a pain, but I was glad to finally get the switch over with.
For Animal Acres it came with just plain PHP. And it's currently a bit of a hodgepodge. I am converting to Fat Free Framework for the base. So page by page have been switching over to using the framework following a model view controller paradigm instead.
When I first started the conversion I was using fat frees object relational mapper for the database, but have since added Laravel's Eloquent to Animal Acres as well and like that a lot better. Fat Free's is very clunky and limited, always felt like it was slower down development so was a good switch. But does mean some areas use fat frees, some use eloquents and some of my models are duplicated as well right now. I also added blade (html template language from laravel) to fat free recently and that has been a welcome switch too. But again does mean my base template is a bit odd to account for it's different uses, plus the duplication from pre fat free area that haven't fully been migrated yet.