I'm talking about projects that currently exist or not.
If they don't exist (as far as you know), they are projects you wish someone could start.
If they exist, they are not mature enough and you are looking forward to see them become more complete.
For me:
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Perl 6. That's by far the FOSS project I currently feel the most enthusiastic about.
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Minetest. The FOSS Minecraft clone. It currently pales when compared to its model, but it progresses fast.
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Tribler. It currently works well enough to have become my main P2P client. Yet there is still lots of room for improvement. And many other functionalities could be imagined (a decentralised web architecture, for instance?)
I may forget some, but those three are the one I think the most about these days.