This is a mod that supports adding holographic gui's to Minecraft. These gui's can be used to interface with blocks or also as standalone gui's (for example when pressing a hotkey). It is also possible to mount holographic gui's to other entities. There gui's provide an immersive way for a player to do various things.
This mod has been created as a spinoff from the Ariente mod. On its own this mod doesn't do anything useful. It needs other mods to add support for its API.
There is a Jenkins (and maven) that you can find here: http://jenkins.k-4u.nl/job/HoloGui/
WARNING! This mod is still beta and as such the API can still change! Be aware of that.