The project by Daniel King allows you to extract the results from the log file gnatprove.out generated by GNATprove, into an Excel spreadsheet. What's nice is that you can then easily sort units according to the metrics you are following inside your spreadsheet viewer.
The project by Martin Becker allows you to extract the results from the JSON files generated by GNATprove for each unit analyzed, aggregate these results, and output them into either textual or JSON format. What's nice is that you can then integrate the generated JSON with your automated scripts/setup.
I have installed both on my laptop, and used them on examples such as Tokeneer, and I am happy to report that the results are consistent! :-) I don't know yet which one will become more useful with my setup, but both are worth a try.