Openni.org did shut down today, but at Occipital, we promised to support OpenNI when we launched our Structure Sensor.
So we’ve created an online resource page to host OpenNI2 binaries, sources and documentation.
The current version works with the Structure Sensor and Skanect, and over time, we will also do our best to maintain compatibility with other existing, Skanect-supported sensors.
Since the project is open-source, any help is welcome. If you are a developer, feel free to get in touch or send pull requests if you would like to contribute.