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NIH's ImageJ. It was designed with microscopy in mind, but I'm sure you could use it to measure angles in any image...I've only used it for SEM images but it should work just fine. Pros: Free and easy to use! Thank your federal government for providing freeware like this - finally, your tax dollars pay off...
This measurement gives you a basic sense of the adoption rate of your software investment. That is, business leaders should create a well-defined set of goals for the transformation effort, rather than simply purchasing and deploying new technology in an effort to stay modern.