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.
Create beautiful user interfaces for immersive VR/AR experiences
...The user experience (UX) can become increasingly complex as new features are introduced, leading to a long list of application-specific interactions that can conflict with each other and can be difficult for users to learn. Hover UI Kit is built to solve this problem. It is a tool for creating beautiful, customizable, dynamic user interfaces.