The three traditional "main" male body families in OpenSim are: Slink Physique Male (Adonis), Signature Gianni (a.k.a. Apollo and Decadence Male) and Belleza Jake (Ares).
As for female bodies, there's also Kupra, but I guess the whole ecosystem is exclusive to only one sim, and I don't recall which.
(Belleza) Freya and Venus exist in OpenSim, too, but I only know one sim that offers clothes for them.
I'm wondering whether it's a good idea to toss the whole Ruth2 family (Ruth 2.0, Ruth2 v4, LuvMyBod etc.) and the whole Roth2 family (Roth 2.0, Roth2 v2 etc.) into one category respectively. Ruth2 v4 is not simply Ruth 2.0 RC#3 with BoM glued on. Ada Radius has modified the mesh so much that Ruth 2.0 RC#2/RC#3 clothing is about as likely to work on Ruth2 v4 as Athena clothing. It's similar for Roth2 v2.
On the other hand, there is no clothing that's rigged for Ruth2 v4, and it's unlikely that there'll ever be any, considering Maxine. So if you have a Ruth2 v4, and you don't want to wear illegal clothing on a legal body you have to make do with Ruth 2.0 RC#3, LuvMyBod, Clutterfly, Damien Fate and lots of self-made alpha masks.
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