Criteria

1. Code in the open

2. Bundle policy and source code

3. Make the codebase reusable and portable

4. Welcome contributors

5. Make contributing easy

6. Maintain version control

7. Require review of contributions

8. Document codebase objectives

9. Document the code

10. Use plain English

11. Use open standards

12. Use continuous integration

13. Publish with an open license

14. Make the codebase findable

15. Use a coherent style

16. Document codebase maturity