Three-way tie. Unfortunately there hasn't been movement on any due to personal stuff, but hopefully soon:
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Pathfinder 2e for a modern D&D-type experience. (Not to yuck anyone's yum, but I have plenty of gripes with 5e.)
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Dolmenwood. Currently awaiting delivery of the Kickstarter. For those old-school D&D vibes.
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Burning Wheel. My favorite game I've never played, even after owning the books for nearly two decades. :P But for real this time!
I would put these in my D&D campaign.