Furniture
Furniture with all three articles: der Schrank, der Sessel, die Kommode, das Regal.
Sports
The games ending in -ball are der, like der Ball. Only das Tennis takes das.
Birds
Two birds with der (Adler, Spatz), two with die (Möwe, Eule).
Things to send
Der Brief, der Briefumschlag, das Paket and das Päckchen: -chen is always das.