For some more info on the Chaosnet, see Wikipedia.
For the original Chaosnet report, MIT AI Memo 628 by David A. Moon, see the attached PDF (original location http://hdl.handle.net/1721.1/6353) or https://chaosnet.net/amber.html for an HTML:ized version.
The Chaosnet Bridge program was written by Björn Victor (bjorn@victor.se) in 2017-2018, based on earlier code (from 2005) for pairwise bridging (ether<->chudp, chudp<->unix), where the Chaos-over-unix-sockets was based on code by Brad Parker (brad@heeltoe.com, see http://www.unlambda.com/cadr/).
BPF support (for Ethernet on e.g. MacOS) is based on code by Daniel Seagraves & Barry Silverman (see https://github.com/dseagrav/ld) and by Ken Harrenstien (see https://github.com/PDP-10/klh10 or http://klh10.trailing-edge.com/).