Perihelion Software Limited was a United Kingdom company founded in 1986 by Dr. Tim King along with a number of colleagues who had all worked together at MetaComCo on AmigaOS and written compilers for both the Amiga and the Atari ST.[citation needed] Perihelion Software produced an operating system for the INMOS Transputer called HeliOS.
[1] This was a system that looked like Unix but which could pass messages to processes running on either the same processor or another one.
Perihelion Software also produced an in-memory database system called Polyhedra.
The group responsible for this product was set up as a subsidiary, Perihelion Technology Limited (PTL), which did a management buyout in 1994.
PTL later changed its name to Polyhedra plc in 1995, and in 2001 was acquired by a Swedish company called ENEA.