The UserTools plugin provides you the building blocks for everything around users. It comes with a CRUD kick start through the UserToolComponent and the UserBehavior. Just load the component and you have a working login and registration. Customize it as you like through configuration or use only what you really need.
This is a CakePHP wrapper for the HTML Purifier lib. The plugin includes a trait, a view helper, a behavior and a shell to clean your markup wherever you like, in the view or in the model layer or clean any table and field using the shell.