I do think the majority of these fall into the "first built in the 90s" category and while they aren't legacy they do have a legacy codebase to deal with. Good

I do think the majority of these fall into the "first built in the 90s" category and while they aren't legacy they do have a legacy codebase to deal with. Good examples though. If you were building them from scratch, I would still question the choice of C++ for these as opposed to C#, Objective-C native UI layers combined with a C core.