OVR LipSync Open Source

This is would be a very productive move.  The OVRLipSync library dates back to 2015 and doesn't get any active support. 

It's still not got a Linux version!  https://communityforums.atmeta.com/t5/Unreal-VR-Development/OVR-Lip-Sync-plugin-for-Linux/td-p/971870

Releasing the source code would allow the community to fill this and other important gaps that are not being prioritized.

Additionally, the specific set of visemes generated by this library has become the de facto standard for all avatars in the absence of any alternative, so a lot of assets depend on it.

I've posted a similar issue in the Godot forums https://github.com/godotengine/godot-proposals/discussions/9718

This move should be consistent with their strategy of support for the Godot platform in terms of its capability to deploy apps on the Quest.
https://www.w4games.com/blog/w4-games-news-1/w4-games-and-meta-team-up-to-expand-open-source-godot-ecosystem-on-meta-quest-28

I've compiled it into a demo Android app https://github.com/goatchurchprime/lipsync through a Godot addon called twovoip_lipsync, so we can use it in Godot now (except on Linux) to see if we can do anything useful with it.  Maybe this will get some attention. 

Meanwhile, it's worth keeping an eye on some tech adjacent projects, such as https://github.com/Project-Babble/ for face tracking that seems to use onnxruntime ai tech.  Given that the https://github.com/xiph/rnnoise library I have compiled into twovoip also uses ai tech to filter out non-speech noise, it is likely that someone who knows this tech could replicate the OVRLipSync library using modern ai tech better than before.