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CoffeeMud is a text-based virtual reality game engine (a MUD). It is a mature, full-featured Java codebase. It includes web (HTTP) and email (SMTP) servers, chat (IMC2 and I3) and web clients, and supports ANSI, MXP, and MSP.
TwometerVR is an open-source alternative to commercial VR hand/body tracking systems. It's primarily intended for those who have VR headsets such as the Oculus DK2 that don't include controllers. It is a low-cost alternative to expensive commercial devices such as the PS Move or Oculus Touch system. An open-source alternative to commercial hand trackers such as Oculus Touch or PS Move, because Virtual Reality should not be expensive. Although there is currently no implementation of full-body-tracking, the system is technically fully capable of supporting it.