This mod renders players from beyond eachother's render distances if there are no blocks in the way. The server side raycasts between two player's eye levels and if there are no blocks in the way, it sends a packet to the client side telling it to render a scaled down player model where they would have been.
This mod is currently in a very alpha stage. Bug reports are appreciated.
This mod was primarily designed to be compatible with Diamond Star Combat so you can see other planes from beyond your render distance.
External resources
Project members

1whohears
Member
Technical information
License
MIT
Client side
required
Server side
required
Project ID