Bukkit

[UNMAINTAINED] Intuitive and powerful plugin to create graphical user interfaces.

[UNMAINTAINED] Create modern looking holograms.

[UNMAINTAINED] Add touch capabilities to holograms made with Holographic Displays.

[ABANDONED]

[UNMAINTAINED] Display colors and text on name tags above the head.

[UNMAINTAINED] Display an RPG-style health bar above mobs and players.