Looks like all the microsoft catalog https://msdn.microsoft.com/en-us/subscriptions/downloads/def...

Depending on the subscription level, you get access to the Microsoft software catalog and can basically download and keep all the licenses you need.

This isn't really something you buy as an individual unless you're a consultant or running a small shop but it's great for enterprises to get the IDE and all the production software as well (Windows, SQL, etc).