UniversalForwarder

Universal Forwarder is a proxy application that manages connections between clients on your Android device, and remote services that may be reachable in different ways, depending on what network your device is connected to. Service connections can be configured to try multiple access mechanisms, including port knocking and SOCKS. It is particularly useful for transparent access to services behind a firewall, or Tor hidden services (using the Orbot app's SOCKS proxy).

Permissions: Universal Forwarder requires the Photo/Media/Files permission for exporting and importing forwardings to/from files, and for writing a debug log (when enabled in Settings). All files are written by default in the Download directory, but the location can be changed in Settings if desired. It requires "run at startup" so you don't have to manually run it to start the forwarder service after boot, and "full network access" for obvious reasons.