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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Second Life is a 3D virtual world where almost all the content is user generated. It has been around since 2002 and publicly since 2003 and has developed significantly since then.
Unlike games Second Life and other virtual worlds do not have built-in goals, levels or similar mechanisms. You can think of it more like a place or a platform. Individual locations and groups in Second Life might offer some or all the features a game might have but Second Life (SL) as a whole does not.
Second Life has a wide range of ages, countries of origin, languages, interests and professions among its residents and is not limited to the typical gamer.
It offers many activities from building, landscaping and decoration over taking pictures and visiting art galleries, attending parties and live concerts, roleplay, travel by and racing a wide variety of vehicles in addition to the built-in teleports, combat both in vehicles and on foot as well as a number of adult activities. And of course you can make great friends and do all of those together.
The Second Life servers are often referred to as "The Grid" of if you want to distinguish the production and preview grids as Agni and Aditi. The OpenSim project is essentially an open source implementation of the server side of SL. There is a Lemmy Community for OpenSim
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Linden Lab Wiki Page about Official and Third Party Viewers
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 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.
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.
I use Firestorm.
For people using MacOS, Ubuntu, Debian, Fedora, OpenSUSE Tumbleweed, or FreeBSD, Megapahit viewer is a nice choice for anyone wanting a mostly-vanilla Second Life experience with a few modest tweaks and added features.
If it doesn't have pie menus I don't care.
Okay Firestorm boomer. Enjoy your 2fps 🤭