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The community that's grown around this routing technology is Hyperboria (https://hyperboria.net/), which is mainly an overlay meshnet via the existing internet rather than an entirely new network with dedicated cables and wireless links. It's got about 700 nodes active right now (and about 1800 links), according to the awesome network visualizer at: http://www.fc00.org/

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Anything more focused on the link layer?

The whole project is. The ultimate goal of CJDNS is essentially to replace the current TCP/IP based internet, or at least to be an alternative global internetwork.

The existence of Hyperboria and the use of VPNs over the current internet is purely due to the fact that the current users are still too few and far between to establish direct links to each other.

Hyperboria isn't focused on an overlay, that is just the easiest way to connect. A bunch of nodes are peered over other channels, like wireless meshes (see the Seattle meshnet).

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