liftOS

If you missed this one your going to kick yourself. I have never worked in a smoother running SaaS CRM. Maybe they will bring it back if your lucky. Its relatively simple to understand compared to some CRMs where your lost from the minute you log in. I don't know where they park this cloud CRM but it can obviously handle a huge load of users for it to run so agile. Hands down best functioning CRM I have tried thus far. I highly recommend.