The Voynich Ninja

I have been working through the Voynich manuscript assembling all the more distinctively spelled words I could find and I have nearly finished. The last words to finish compiling are the words on pages with text written around circles. I have been using Microsoft Paint as it is simple and I know it well, however it is not very useful well dealing with text written around circles as the rotate options are very limited. I have Photoshop, so I know there are more complex tools that would do the job. But Photoshop has a lot of functionality that I don't need for this purpose and I want to make to process as simple and straightforward as I can. I wonder if there is some program like Paint, but with better rotate page functionality. What programs do other people use for working with Voynich images?
Also I wonder if maybe there is program that can flatten the circle text in one go.