We haven't (yet) prioritized an official physics plugin for Bevy, but the Rapier physics engine has their own official Bevy plugin, which is the de-facto standard at this point.

It supports opt-in determinism, which should be great for some networked physics scenarios.

https://rapier.rs/docs/user_guides/bevy_plugin/getting_start...

The story is similar for networking. Ultimately we will have a built in api, but we're focused on more fundamental things at the moment. There are _tons_ of community-developed networking plugins though: https://bevyengine.org/assets/#networking