I was about to ask the same thing, PartyBear. What else?
I know in Japan they released a few more games, like the Captain Tsubasa games and I think the Wonder Project J games (EDIT: oops), but for North America, all I can think of are the three NES Ninja Gaiden games, the trilogy on the Super NES, Tecmo Bowl (and probably a Super Tecmo Bowl or other variants), and that's pretty much it.
So, essentially, they're "aggressively" supporting the Virtual Console with two major series...and that may be it? Maybe we should look up Tecmo's profile on GameFAQs... EDIT: Apparently they did Solomon's Key, Fire 'N' Ice, Rygar, and a bunch of other Tecmo sports games.
Anyway, I just want to say that Ashtar from Ninja Gaiden II: The Dark Sword Of Chaos was one of the coolest villains EVER. Or at least, he looked pretty crazy evil at the time, not many NES baddies even came close.