This looks pretty interesting! is a theorem prover based on homotopy type theory, with IDE support for IntelliJ:
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There's an announcement post here for those interested: groups.google.com/forum/#!topic/ - gives a bit more background into why is working on it!
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Seems like it's mainly there to explore how modern IDEs could be used for theorem proving, which I think is a great goal! Would be cool to see more creators of dependently typed programming languages looking beyond Emacs, to supporting things like the Language Server Protocol.
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Oh wow, it seems they have a whole research group working on it: research.jetbrains.org/groups/group-f
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