Best retro sims that still hold up in 2024?

Does anyone else remember when sim racing felt a bit more... pure? I’m getting really nostalgic for the days of GTR2 and the original rFactor. Back before everything was about high-stakes esports and direct drive wheels that cost more than my actual car. I’m looking for some recommendations for older sims or specific mods that still hold up physics-wise today. I want to go back to my roots and just drive some 90s GT cars around a modded Nurburgring for the pure joy of it. What are the best classic titles that you guys still keep installed for those late-night sessions? Any old-school sim forum gems or gear setups from that era I should revisit?