E-machines made some combo Display+Ethernet NuBus cards, I have one in one of my IIsi's :)
E-machines Colorlink SX/t (10Base-T, twisted pair version, the one I have)
E-machines Colorlink SX/2 (10Baset-2, coax version)
E-Machines Futura II LX (supports a daughter card that adds Ethernet, ...read...