Technically, everybody with a modern system using Serial ATA uses serial cables I'm going to assume you mean old DE-15 stuff, though. I have recently used a USB-to-DE-9 adapter for a serial console for some AMD Geode systems. I (rarely) use one for my old LEGO Mindstorms infrared block (I got the thing way back in the days of Windows 98 and having to download special drivers for USB hardware).
UPS from various manufacturers still have them
AV equipment as well
Many networking vendors require them
Alot of Alarm company require them for configuration
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