There are coding rules engines, such as PMD, Checkstyle, Findbugs, and Macker, that serve different purposes and can be used together to improve code quality. These tools target specific areas of coding, including conventions, bad practices, and potential bugs, with the goal of enabling developers to work more efficiently and effectively. By using these tools in conjunction with each other, developers can identify issues and improve their coding skills, ultimately leading to better software development outcomes.