First of all, I thank you for kindly help. It may be any type of data related to process or product metrics. If it is well-organized and easy to process by any machine language tool , it would be perfect.
I am planning to ask my students to develop a model in order to evaluate the quality of a software product. it would be useful to obtain both software process and product metrics all together for any software and so that it helps students to suggest a better quality model. By the way, they are going to learn software metrics and quality issues, applying machine learning techniques at the same time.
I know what to do, and thank you for explanation in detail. I am sure it would be useful for other interested researchers.
However, my question possibly misunderstood. I ask for free software metrics data repositories for researchers.is there any data resource you know that is related to my expectation?