Between 2005 and early 2020, MaraDNS was updated by a shell script which would run a bunch of patches against the code to make a new release.
Between 2010 and early 2020, Deadwood was updated using similar shell scripts.
This allowed me to track changes without having to use a revision control system. In 2014, I started using Git to make some of the changes, but I did not transition to making stable releases directly from Git until 2020.
This directory has the full history of Deadwood changes done using this system.