The Vibraplane is commonly used for microscopes and in the audio world. They have both active air and passive air models (with and without pump). They are expensive at around $4000.00, but are highly effective at isolating components.
Isolation Passive/Active???
I recall 2 models of isolation tables or platforms that were active and passive, however, I can not remember the manufacturer. The units were promoted for turntable isolation and if memory serves me, they were originally intended for microscope isolation. Help with my memory will be appreciated.