only absolute oldies remember the one mod to rule them all in regards to barotrauma
barotrauma extended
i think it was discontinued when the game moved to steam which is a shame because the mod had 3 times more content than the base game
BTE still exists, people still use it. That being said, I'm unsure if it's run by the same fella.
Honestly Baro is a pretty great game. Since I've pretty much left the Gmod community other than joining servers or other halfbaked projects I'm invited to (until they die a week later), I put almost all my gaming time into Barotrauma and Arma.
It's gotten to the point in Baro where I don't even play normal mission or campaign servers anymore, as I've seen & done it all so many times. Now I just sit back, join a Semi-serious Station RP or Survival RP, (RP being used pretty loosely here honestly), and then play my chosen role for the evening.
I enjoyed doing that so much that I spent a month doing a full conversion custom variant of the most popular "Station" (Prometheus), and integreated 3 mods into it.
Thalassophobia which adds Scientists and Clowns as actual roles which can do actual wacky shit like DNA transplanting, growing plants that create zombies or melt hulls, sacrificing people's blood to summon zombies or useful bits, etc.
EK Armoury & EK Utility which expand upon the game's basic weapon and tool infrastructure.
I also coded a custom joblist utilizing all of the above content, and now host Station RP/Survival servers. Laugh all you will, just playing Baro on a giant station like it's SS13 is insanely fun.