A good free alternative is Mate Engine:
https://github.com/shinyflvre/Mate-Engine
https://github.com/shinyflvre/Mate-Engine/releases
available also for Linux:
https://github.com/Marksonthegamer/Mate-Engine-Linux-Port
(Mate Engine is also available on Steam with some extra features, but the free version is more than enough)
it supports custom VRM characters, so you can use the free software VRoid Studio to make your own VRM character, or download characters/outfits/accessories (free and paid, you need Pixiv account) from the VRoid Hub:
https://vroid.com/en/studio
https://hub.vroid.com/en?lang=en
https://booth.pm/en/items/3226395
edit: I made now the official thread of Mate Engine with all useful information!
https://vocaverse.network/threads/mate-engine.10455/
https://github.com/shinyflvre/Mate-Engine
https://github.com/shinyflvre/Mate-Engine/releases
available also for Linux:
https://github.com/Marksonthegamer/Mate-Engine-Linux-Port
(Mate Engine is also available on Steam with some extra features, but the free version is more than enough)
it supports custom VRM characters, so you can use the free software VRoid Studio to make your own VRM character, or download characters/outfits/accessories (free and paid, you need Pixiv account) from the VRoid Hub:
https://vroid.com/en/studio
https://hub.vroid.com/en?lang=en
https://booth.pm/en/items/3226395
edit: I made now the official thread of Mate Engine with all useful information!
https://vocaverse.network/threads/mate-engine.10455/
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