There's also an 1802 Membership Card—which I knew as the COSMAC Elf Membership Card [1][2]. Switches and LEDs. I built one of these kits a decade ago but mine didn't work. (I still need to pull it out and try to debug it. For all I know I did assemble it correctly and there is just a RUN switch or something I did not know to flip.)

[1] http://www.sunrise-ev.com/1802.htm

[2] http://www.cosmacelf.com/gallery/membership-cards/

Nice, I clicked to see if anybody had mentioned "the original." I built one of those as well. It is a very cute little system, and the 1802 is simple enough that the little front panel is a somewhat usable interface.