Who are the main commercial cubicle manufacturers?

The major players are Herman Miller (AO2, Ethospace), Haworth (Unigroup, Premise), Steelcase (Answer, Avenir), and Knoll (Morrison, Currents) — each with proprietary components that aren't cross-compatible, so when adding to an existing system you need to confirm the exact system name and generation. FindOfficeFurniture.com sources and configures multiple major system brands — call 888-719-4960 for a brand comparison.