Open Government NSW is a project created by Greens NSW MLC David Shoebridge and staff.
It aims to make easily retrievable documents provided by the NSW State Government usually via the process set up by the Government Information (Public Access) Act 2009 (GIPAA).
A NSW GIPAA is quite similar to what many people know as the Freedom of Information process, as that it is what it is called at the federal government level.
You can find out more about GIPPAAs here
You can find out about Freedom of Information here