Osirus/Vavra/OsTirus
The DSP56300 project exists to create an emulation of the Motorola 56300 series DSP chips (and associated hardware) that was used in many late 90s/early 00s synthesizers. Several projects have been released so far and the team is working on more. These aren't so much VSTs as emulations, closer to something like a video game console or computer emulator than an approximation.
Osirus is an emulation of the Access Virus A/B/C.
Vavra is an emulation of the Waldorf Micro Q.
OsTirus is an emulation of the Access Virus Ti series.
The plugins do not work out of the box - they require a copy of the original OS ROM file in order to work. However, they are completely accurate (other than the D/A converters on the hardware).