Coala is an open source tool that finds issues in code and automatically fixes them. It supports many programming languages and text editors/IDEs. It can be run from the command line or integrated into continuous integration systems. Coala finds issues related to code style, syntax, security, documentation and more. It is customizable through configuration files and supports over 55 programming languages. The developer encourages users to try Coala, provide feedback on issues found, and remain passionate about improving code quality.