Praeter is a Bukkit framework for using Resource Packs in plugins.
The project is still in its early stages! There is no download for the built plugin jar, and the modules are not on any maven repository yet.
The core module handles resource packs.
The praeter-gui module allows you to create custom graphical user interfaces.
Praeter provides an abstracted API for creating GUIs. Read the
Getting Started page or the
Creating a GUI page.
Praeter handles creating the resource pack, sending that, creates the buttons, including the text, handles item movements, etc. See the bottom of the Creating a GUI page for the code to the GIF above (it is only 33 lines of code!).