"UniBone" is a Linux-to-UNIBUS bridge, implemented with a BeagleBone Black micro Linux system.
UniBone can keep old PDP-11s running, by emulating devices and aiding in repair.
UniBone is very similar to its QBUS successor "QBone".
The articles here address different audiences: either they describe some aspects of UniBone for end users, or they explore technical details.
Dynamic discussion at the Google group.