This application allows you to load an image file and convert it to a excellon drill file. For best result, you can adjust color, tolerance filters and circle recognition parameters and see a preview image before creating output file.
Demonstration video: Coming soon!
Useful information of this application through:
https://imagetoexcellon.wordpress.com/
If you need to convert from image to gerber, check this app:
https://sourceforge.net/projects/imagetogerberconverter...