Yes, the idea was to have free and open-source mesh bodies to use as parts of starter avatars.
Ruth (the plain, no-attachment starter avatar in the painted-on lavender shirt and the painted-on red trousers) was just plain ugly, and so was Roth (the same avatar if you switch it to male). Every last alternative was stolen from SL and therefore illegal. At least some grids flat-out refused to offer starter avatars with illegal content, but pretty much all they could resort to was the system body + Linda Kellie.
So Ruth 2.0 was created in 2017 by Shin Ingen, Ada Radius et al. with the intention to have a new "standard" female mesh body for OpenSim. Roth 2.0 followed suit in 2018. Both never saw a proper release; Ruth 2.0 was stuck as the release candidate RC#3, and Roth 2.0 made it to RC#1 before the project was largely abandoned.
RuthToo RC#3 and RothToo RC#1 are forks by Sean Heavy who gave them a number of improvements, but rendered them halfway incompatible to what few clothes had been made for Ruth 2.0 and Roth 2.0 up until this point.
LuvMyBod is a RuthToo RC#3 fork by Hyacinth Jewell that came to exist because neither Ruth 2.0 nor RuthToo was "chunky" enough for Hyacinth's tastes and requirements. Ruth 2.0 in particular is a rather slim body with a small waist and a small butt. LuvMyBod is the closest to an "hourglass" variant that we have without being as exaggerated as Decadence-HG. LuvMyBod has since been discontinued and replaced with a BoM successor named Diana.
Ruth2 v4 and Roth2 v2 aren't forks, they're official continuations, now headed by Ai Austin. He and the old RuthAndRoth team also decided to declare the old bodies final releases and rename them Ruth2 v3 and Roth2 v1 to allow for proper version numbers. However, they aren't just the old bodies with BoM glued on. Ada Radius has thoroughly remodelled both, unfortunately breaking compatibility again, partly because the whole rigging was reworked to make the bodies resemble actual humans with muscles underneath their skins rather than showroom dummies.
Oh, and if you take a look at the Github repositories (
https://github.com/RuthAndRoth), you'll notice that Ada has started working on Ruth2 v4.1. I think now would be a good time to send in some bug reports to tell her what, if anything, is wrong with the bodies.