Yup, CivNet seemed the most popular for a while. Somebody also put together a mod archive for WinCiv. I also found there’s an open-source decomp project that is “playable”, but I haven’t looked at how mature that one is.

I’ve been leaning more toward UnCiv and FreeCiv21 with a Civ 1 style tileset. Think I prefer the Civ 2 ruleset though.