[chriswarbo]

Croquet's always been peer-to-peer, with no need for servers. It sounds like they've made a small server to "reflect" traffic between clients that can't directly communicate (like using a STUN server to coordinate SIP/WebRTC).

> Does anyone understand whether at least the client side component of the Croquet OS, which interfaces with the Microverse, is open source so that alternative server implementation could be developed without legally dubious reverse engineering of the protocol?

I don't think any reverse engineering is needed, since the protocols (e.g. TeaTime) were published decades ago. AFAIK the existing Smalltalk clients are FOSS (OpenCroquet/OpenCobalt); there have also been JS ports in the past (I think as part of Qwaq/Teleplace/Terf), but I can't remember if they're FOSS; those may be the same as this "Croquet OS", or this could be a rewrite.

(Yes, this project has had many names over the decades!)