If you have been around even a short time in the ERP software business as either a user or a provider, you are sure to know of the latest acquisitions. The big ones of course are all the companies Infor bought as well as the Oracle mega mergers of PeopleSoft/JDE. Here is a website dedicated to tracking these acquisitions, called fittingly enough The ERP Graveyard.
The ERP Graveyard has a spreadsheet of acquisitions going back to the 1990’s. So if you are interested in what happened to so-and-so software, you might find your answer to dead ERPs here.