The Software Due Diligence Checklist is a comprehensive list of items to consider when assessing the quality of a software application or system. It includes items such as user interface design, security, scalability, extensibility, and maintainability. The checklist also includes functionality testing, technical debt, code style, and performance. Furthermore, it can help organizations identify potential risks and opportunities associated with the software. Ultimately, the Software Due Diligence Checklist is an invaluable tool to help organizations make informed decisions about their software investments.