Nitromax has been available for quite some time. It's made by Tropical Science Biolabs, which is a DBA (ficticious business name) for Great Western Pet Supply. The website for Tropical Science Biolabs (tsbiolabs.com) was taken down about a year ago with no explanation from the company. However, all of the products have been made available for ordering from the Great Western Pet Supply website
I have no idea how they make it or where they get it if they get it from a supplier.
I rank it below Bio Spira. I have found it performs similar to Seachem Stability.