Software
The GIVE software is open source and can be freely downloaded from our Kenai project website. A good starting point is the Wiki.
The Kenai website features software (game engine, networking, planning system, etc.), documentation, demo worlds, a user manual, and the GIVE NLG system developers forum. It contains everything that you need to implement and test your own NLG server, and could be used for running a local GIVE challenge at your own institute.
You can also try a prototype of a proof-of-concept GIVE-2 NLG system in action here. [Notice that this triggers a 9 MB download right now. We plan to optimize this in the future.]