These proxies are created for MCPI Reborn or can be used for it. Proxies can be used for transporting players into another server otherwise it being used as a packet translator for another edition of Minecraft.

Proxies for MCPI
Proxy Maintained by MCPI-Revival team? Description Github Link
MCBES Yes A proxy and packet translator for bridging Minecraft pi and Minecraft pocket edition. https://github.com/MCPI-Revival/MCBES
proxy Yes A Minecraft Pi Proxy to allow players to connect to remote servers. https://github.com/MCPI-Revival/proxy

These are the only known proxies that work with MCPI Edition.