Performance of MI tools in perspective of open source software

There are numerous ways to determine software maintainability but none of them has been able to become state of the art technique for calculating software maintainability as much as the maintainability index (MI). Software maintainability has always been a serious concern in holding all the aces of any software product. Different tools and techniques have been introduced to calculate maintainability index of the software system, and there are many MI calculating tools available for calculating software system´s maintainability but the availability of these tools doesn´t mean that it can solve the problem in achieving the software maintainability. Who will look for the flaws in those MI tools? Who will standardize them? This is the emerging issue that is being raised in the current paper. For this purpose we have analyzed behaviors of various open source software products and trailed them on different MI tools which are best available tools for calculating MI. The results highlight the defused behavior of these MI tools and urges for the standardization of calculation mechanism of MI which could lead the software industry to a better and maintainable software systems.