Project Aincrad is an on-going fan project recreation of the game from the show Sword Art Online in VRChat. The world currently features PvP ,PvE, economy, saving system and more. It is made by the team ArgusVRC consisting of contributors from around the world.
The world have over 1M visits and 120k favorites.
My contributions

BGM system
System for background music in the world. The audio can be loaded locally or remotely and fade in and out according to the location and in world time. Music is also synced with all other players using server time.
Localization system
Implemented a system to localize the existing world under VRChat constraints. Using attributions and reflections in combination with editor script to switch out strings at runtime without massive change to existing systems. The string is also exported into Weblate for collaborative translation.

Mobile/Controller support
Implemented support for mobile and controller control scheme for all the world specific features.

Rental
An individual room player can rent out to have a private space in world. Room have access control and voice isolation.
Directional teleport crystal
A teleport crystal that can be pointed to roughly the town location to select the teleport point.