Pie in the Sky Software started in the late 1980's. The first product was a 3D screensaver for DOS called Innermission. It was a 'TSR' which stood for 'Terminate and Stay Resident' program. It was shareware and cost $5.00.
The POWER 3D Engine is the engine powering the Pie in the Sky 3D Game Creation System toolkit from the '90s developed by Pie in the Sky Software in 1992-1995...