The computers appear to be all Macs: in the back, a blue-and-white Power Macintosh G3, circa 1999. To its right, a Quadra 800; to the left, Centris (or Quadra) 610 (or 660AV); in the middle foreground, an Apple IIGS. In front of the Quadra, an iBook G3.
What can I say? I’m old.