AltCore

AltCore adds a custom player inventory screen, accessory slots, and backpacks whose slots are added to the player inventory. In addition, the mod overhauls many vanilla screens into a unified Universal GUI system with support for style presets, configurable spacing, sizes, positions, and the overall look of the interface.

What the mod already has:

• A custom inventory that fully replaces the default one;
• Full support for all standard Minecraft screens;
• A new player inventory screen;
• An accessory system and additional slots;
• Backpacks that expand the inventory;
• Built-in style presets and the ability to create your own;
• Flexible interface customization, including moving windows within each screen;
• Overhaul of many container and utility screens;
• A simplified /gm 0,1,2 gamemode command.

AltCore is currently in v0.3 Alpha.

What is planned for future versions:

• Fixing effect display on the custom inventory screen;
• Configurable default panel positions on screens;
• Compatibility with JEI, NEI, and others;
• Automatic support for other modded containers;
• Further development of the accessory system;
• Further development of the backpack system with auto-pickup, placement in the world, and upgrades;
• More customization options, including custom textures in any screen, gradients, and animated colors;
• Support for changing the player HUD;
• Tactical-style layout presets similar to TaCZ and others;
• The ability to add any item as an accessory or backpack with custom properties via config;
• Implementation of the /inv "name" command for server administrators.