Since I run Linux mostly firestorm as well. Many of the others are largely windows only. Outside of kokua or whatever it's called and a few others. Radegast as well. Saw someone forked and started it again only to see it sort of disappear again.
Second Life
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I am on Linux as well. I thought Radegast wasn't actively developed anymore?
For a brief moment someone forked it and was pushing some new releases. Under the moniker radegast-ng. Was even in the AUR. But the website and all the hosted documentation has gone again. And just the git remains.
Which is really sad. Most of the other alternatives that I'm aware of, aren't really alternatives. Or all want to be cloud-based and charge for it. Rather than letting you roll your own.
Firestorm all the way for me, because I really appreciate the additional features, in particular the built-in AO. I've been using Firestorm since before it was called Firestorm (cough)Emerald(cough). Yes, I am that old, lol.
Firestorm all the way for my daily driver, though once Alchemy catches up to all the QOL features that FS has, I'd love to switch. 120FPS goodness, but still fairly basic and the trade-off isn't quite balanced for me yet.