The Dink Network

There are many influential D-Mods. Prophecy of the Ancients would be the first one, since it showed making an Epic is possible. The Stone of Balance -series set a new style and a new high which still stands today. Initiation and Scarab are important too. One set a new high for interesting gameplay, whereas the other set a high for dialog, storyline and the cool sandbox element. And even though it may sound a bit selfish, I really do hope HH2 will inspire some people in some way.

So I'd say the Epics would be the most influential ones. Not all of them though. If I had to pick just one, I'd say Prophecy of the Ancients is still the most influential one.