VoxelUI

VoxelUI lets developers describe screens in XML and style them with MCSS, a CSS-like language, and reuse components across several interfaces. The project aims to give mod authors a way to create rich, maintainable interfaces that draw with Minecraft's own rendering rather than large PNG-based UI sheets. Other mods that need structured interface systems can build on VoxelUI, which adds no gameplay content of its own.

The mod is at an early stage: it is a public beta, some components are incomplete or behave roughly, and the API has changed between beta versions. Layout rendering regressions in edge cases are still being identified. The beta is meant to test the framework on real mod use cases, expose weak points in the API and component system, and bring the engine to a stable state before release. Development builds keep showcase and inspection tooling available, while release builds disable it by default.

Installation is only needed where a mod depends on it. The server and every player need the mod installed. Files are published for NeoForge on 1.21.1, with 0.3.0 as the latest file. The code is open source under the Apache License 2.0, and the source code, issue tracker and wiki are publicly linked.