Yggdrasil and GNUnet seem like more interesting alternatives to me (with cjdns and hyperboria as cousins). Although these do not build on wireguard, they employ

Yggdrasil and GNUnet seem like more interesting alternatives to me (with cjdns and hyperboria as cousins). Although these do not build on wireguard, they employ the same basic stack (plus some to handle a mesh topology).