Storms Attack of the Props Incredible low gravity TTT server(if you liked to prop kill as a spectator)...and played it for a couple of years when I was kid before the guy who owned it decided to shut it down. "Those were the best days of my life."
I used to be apart of an active community called AlcatrazReloaded and it was a css jailbreak server. It was a lovely community but alas it was killed by the release of CSGO and the owners not having the time to support the server and lack of interest. RIP 2013-2016
Back in 2012-2016 there was a community called Vrs, they were German based and hosted gmod zombie survival servers, it was great fun but saddly due to arguments between owners the community suffered a schism and essentially disolved, closest thing I ever got to another community is sgm now
I was part of the L4d2 MGFTW - community. It was a TTT server on left4dead2. About 40-50 people were part of the community and were playing like daily/weekly. This lasted for about 6 years in which people grew up and stopped playing or stopped due to changes made to the server (adding bots to fill up open spaces). Most of these people i still have on social media, for example we had a facebook group. I have a tattoo commemorating this group of people and the years i enjoyed
My first gaming community was a Cs-1.6 server called Padina city public, which was a local server for the city I live in. My first gmod gaming community was one of those No rules TTT servers and then I quickly moved to SyndicateGaming TTT servers.
The first community I was associated with was the Garry's Mod Community; Best Serious RP. It underwent a number of name and management changes until it died back in either late 2015 or early 2016. I don't quite remember off the top of my head to be honest.