sentences:  The native operating system of the PlayStation 3 is "CellOS", which is believed to be a fork of FreeBSD; TCP/IP stack fingerprinting identifies a PlayStation 3 as running FreeBSD, and the PlayStation 3 is known to contain code from FreeBSD and NetBSD.The 3D computer graphics API software used in the PlayStation 3 is "LibGCM" and PSGL, based on OpenGL ES and Nvidia's Cg.LibGCM is a low level API, and PSGL is a higher level API, but most developers preferred to use libGCM due to higher levels of performance.