Python Open Room Correction is a method wrote by Mason Green and based on the works of Balazs Bank. His publications are available on the AES website. It is a parallel filters correction at fixed frequencies converted to a FIR process. More about Mason Green scripts can be found here …
There are some sofwares to simulate room modes for simple room geometries (ie parallelepides) and infinitely rigid walls. But this is not real life. Real modes won’t exactly correspond to those calculations because acoustic dimensions are not exactly same as physical dimensions. You can expect an error of 5% or …
The main problem before or after measurements and correction is the listening session. How can you avoid to be influenced by graphs, by forums, by friends ? I can only give a few tips in the way of neutral sound: listen preferably in mono with only one loudspeaker, timbral defaults …