The bulk of the OS is based on the excellent GNU tools and Berkeley 4.4 Unix.
Excellent support is available.
Security, performance and stability issues. Coming from I-405, take exit 13 onto NE 4th. Head West across 112th Ave., turn right on 110th Ave., park in the Koll Plaza lot at the 2nd driveway on your left. Someone will be in the lobby until 7pm. They should validate parking.