Tu58fs is a tool to share files between a DEC PDP-11 and a modern computer.
The software emulates an TU58 DECtape II, which is controlled by the PDP over serial RS232 line.
The "tape content" appears as plain files in a shared directory, and can be accessed on both sides.
XXDP and RT-11 filesystems are supported.
Can also download and start TU58 DD boot loaders over serial console.
Written in C, should compile on every Linux platform.
Online docs here
Still BETA.