* [Calabi v2.2.0](https://github.com/calabinet/calabi) – Self-hosted tunnels and a private WireGuard mesh that lets a client open outbound connections to an edge server and join machines to a stable network.

* [gRPC Tunnels v0.4.0](https://github.com/jhump/grpctunnel) – A Go gRPC tunneling library that carries gRPC requests over gRPC using bidirectional streaming for forward and reverse tunnel scenarios.

* [PORTAL v2.6.1](https://github.com/gosuda/portal-tunnel) – Permissionless, self-hosted end-to-end encrypted relay network for exposing localhost to the public internet.

* [Piko v0.9.1](https://github.com/andydunstall/piko) – Reverse-proxy tunneling server routing HTTP(S) and TCP traffic to outbound-only upstreams, designed for production clusters and Kubernetes.