I would like to have the list of commentators of the Vishnu Purana. How many of these commentaries have being translated to English? Are any of the commentaries available online?
The Srimad Bhagavatam has the greatest number of commentaries of any Purana. Still, I know of two commentaries on the Vishnu Purana:
Sridharan Swami's Atma Prakasha, written from the viewpoint of Shuddhadvaita. You can read it in Sanskrit here.
Engalalwan's Vishnuchittiyam, written from the viewpoint of Vishistadvaita. You can read it in Sanskrit here.
Unfortunately, neither of them have been translated into English.