Raspberry Pi¹ for DOS
https://www.youtube.com/watch?v=ogHqmjn6sY4
Kinda interesting decisions. Hardware recreations of the Pentium and various vintage sound cards, handles various problems like ISA³ not being available on modern computers (in case you want to connect a sound card directly), can present USB kbam as PS/2 kbam, and presents an sd card as a DOS-recognizable hard drive.
¹ Not literally²
² Except it also has a literal RaspPi inside as a USB helper
³ Edit: Oops