A couple of months ago, I decided to try compiling the Doom 3 open source code - called Dhewm3 - in order to replay one of my favourite games. The vanilla Doom 3, a 32-bit app, doesn't work on Catalina, but Dhewm supports 64-bit and many other improvements, so I gave it a go - and succeeded. There's a half-a-bug in Catalina and the way it handles hi-dpi for games, so I had had to wait until I found a fix and then made a script to work around that limitation and include the Redux mod textures that give the game a breath of new life. Since many of us are staying at home due to COVID-19, I thought there could be people out there interested in killing time and some hellish monsters, so I decided to make the files available. All relevant files (should be) included in the linked archive - you will need the game files, of course, them .pk4 files from the original installation, as well as the freely available Redux mod. Enjoy!