Software
There is a software emulator of the MS-20 included in the KORG legacy Collection called MS-20EX. This same software emulated MS-20 was also part of the LAC-1 expansion for the Korg OASYS and is one of the Korg Kronos sound engines.
KORG DS-10 is a music creation program for the Nintendo DS that emulates the Korg MS range of synthesizers.
KORG iMS-20 is an MS-20 emulator for the iPad.
Read more about this topic: Korg MS-20