Okay, here's a start.
Two names that shouldn't be missing are Linda Kellie and Selea Core.
You may want to go around Wright Plaza (
https://opensimworld.com/hop/75040) which is chock-full of shops run by original OpenSim creators such as Sean Heavy, Hylee Bekkers, Oopsee Joseppe (layer stockings!), Elif Kling (important source for make-up for Ruth2 v4!), Caro Fayray, Nebadon Izumi (who also built the whole place), Warin Cascabel, Suzi Avonside etc.
While you're in OSgrid, also have a look at Festa 24H which has probably been removed from here again. There you can find more creators such as Prinz von Halberstadt or Morgaine Alter.
Also, in OSgrid, visit RuthAndRoth, the official sim of the Ruth2 and Roth2 projects. People involved in these:
Shin Ingen (former project lead up to Ruth 2.0 RC#3 and Roth 2.0 RC#1)
Ada Radius
Sundance Haiku
Serie Sumei
Sean Heavy (creator of the RuthToo and RothToo forks, offers his own products on this sim as well)
Austin Tate a.k.a. Ai Austin (current project lead for Ruth2 v4 and Roth2 v2)
Contributors also include:
Eloh Eliot (skins)
Chip Midnight (skins)
Linda Kellie (skins, layer clothes)
Next, creators of original mesh clothes including clothes rigged for Ruth 2.0 or other bodies from the family:
Taarna Welles
https://opensimworld.com/hop/75031
Also,
https://opensimworld.com/hop/74862, and then go to La Baronnie which isn't listed here
Klarabella Karamell
https://opensimworld.com/hop/82702 (it's online, she has removed the beacon)
https://opensimworld.com/hop/81258 (it's online, she has removed the beacon)
Uses store space here:
https://opensimworld.com/hop/78061 (there's also stuff by other creators here, including my Cary Bean/Deva Moda corner, but not everything here is "clean")
Has a shoe store here:
https://opensimworld.com/hop/80119
Loru Destiny
Has deliberately removed the listing of her shop sim from OSW; I'll have to look up the taxi
Also has a store here:
https://opensimworld.com/hop/81253
Hyacinth Jean
Has a shop sim on her own grid with her bodies LuvMyBod (RuthToo fork) and Diana (continuation of LuvMyBod with BoM) and clothes for LuvMyBod which isn't listed on OSW; I'll have to look up the taxi
Her Ruth 2.0 clothes can be found in a shop here:
https://opensimworld.com/hop/81253
If I've listed multiple sims, that's always because there is no one place where all creations by these creators can be found, and each place has some exclusives.
What makes finding and listing creators more difficult is that many have their stores in places that aren't on OSW. RuthAndRoth isn't here. Vbinnia Radek's legendary Steam isn't here anymore. Taarna Welles' La Baronnie isn't here anymore. The whole Nara's Nook grid is absent from here, and HG-Safari host Thirza Ember offers her layer swimwear and lingerie there (some of her simwear can be found here:
https://opensimworld.com/hop/75544). There are several sims in Craft-World with original content (including Damien Fate-based clothes as well as layer clothes useful for BoM bodies) that aren't listed here. And I can name three sims in Dereos with exclusive content that aren't listed here either.
The above is also why people claim that there's literally nothing for Ruth2 v4 to wear (because pretty much none of the big freebie sims offer "rigged for Ruth2" clothes) and then wonder where Juno gets all her clothes.
I'm working on off-site shopping guides for the Ruth2 family, especially the BoM bodies which will completely leave out illegal content. It will, however, list shops offering clothes based on meshes by Damien Fate which were originally created for Second Life, but then offered to the OpenSim community (
https://outworldz.com/Secondlife/posts/mesh-templates/).
Last but not least, Damien Fate and Arcadia Asylum technically only count as Second Life creators. (No, Arcadia Asylum has never been in OpenSim herself.)
One more thought: Maybe someone should start a group in OpenSim (yes, in case you haven't noticed, OpenSim has user-created, user-maintained groups:
https://opensimworld.com/groups) for legal content and especially content created in and for OpenSim. I already have one for the Ruth2 and Roth2 mesh body families:
https://opensimworld.com/groups/1014