BreakoutAPI

BreakoutAPI allows developers to create new windows that run alongside Minecraft. All the windows run on the same OpenGL context, so all the game assets and data is shared between them. With this library, you can create external GUIs, maps, inventory reports and much more - you could even render a portion of your Minecraft world from a different perspective, or split in-game GUIs between physical screens. To get started using BreakoutAPI in your own mod, have a look at the README on GitHub.