Aetherius is a voxel based game experiment being written in Java with LWJGL. It provides a procedural universe that runs infinitely in every direction across infinite worlds, with thousands of materials. All the non-procedural content is made with a suite of software that ships as part of the game. Aside from the pre-baked content and the modder, the game also procedurally generates content from mixing and matching an abundance of components that the player has the ability to add to or remove from. This content includes NPCs, Quests, Machinery and Materials. Aetherius is a true sandbox. The player can toggle every single aspect of vanilla gameplay, and construct their own game rules to suit themselves. It is fast approaching a viable alpha test phase.
Screenshot shows the completed inventory, with hotbar, hover highlight, some items, and the preview / description pane on the right.
One thing to note is that the blocks will be represented by a cube, rather than a sqaure, and other items will be represented by their corresponding voxel models. The larger view in the preview pane will be a larger 3D representation that rotates slowly. For now, we're using squares. :-)
The number of entries in your inventory and in your hotbar will be upgradeable a number of ways. 6 is the starting amount, although I'm thinking of limiting it to four and having two be easily earned in the first few minutes of gameplay.
Let us know what you think.