Coral Common Lisp on a Mac Plus. Still viable today, over thirty years later, as Clozure Common Lisp.

The Sharp EL-5813 (http://www.rskey.org/el5813). I still have the one I bought in 1980. Works like a charm. I can't even remember the last time I changed the batteries.

The original Keurig K-10 mini (the one without the DRM).