[thedougd]

Amazingly some companies like Hyland still ship software that requires IIS. Bonus add are the pages and pages of setup instructions.

[pjmlp]

Sitecore, Microsoft as two other examples.

Sitecore on the classical XP/XM stack, they don't seem to be bothered to update it to modern .NET, as the new products moved away from .NET (XM Cloud and co).

Microsoft still has stuff like Dynamics 365, running .NET Framework.

[robotnikman]

And NCR from my experience.