Unconfirmed but likely dragon dreamers? [spoilers main]
So far we have as confirmed - Daenys, Daeron the Drunken, Aerion, Egg, Aemon, Daemon II Blackfyre and Daenerys and then, semi-canon if you take HOTD seriously - Aegon the Conqueror and Helaena. Also I think Shireen is probably a dragon dreamer as well but unconfirmed.
It seems odd that there is such a massive gap in the Targaryen tree between the last known dreamer and the generation of Daeron/Aemon/Egg/Daemon II where it's like every other kid is a dreamer. And then another gap until Daenerys (and maybe Shireen). Unless there's a magical reason for the timing of these dreams showing up, it's possible there are other dreamers who we just don't know about yet - any guesses?