Nextube is a Kickstarter and Indiegogo project to make a Nixie tube style clock.
There are some promises from Rotrics (the people behind the hardware) to release proper development tools, but these are some notes on how the API works until that is here; for general community information see the Facebook group. In particular there's a great "Community User Guide" available there in the Files section that is far far better than what you will find on the Rotrics site.
On the wiki you'll find some unofficial notes. Using any of this can probably void your warranty, or at least make it difficult to support you, if you don't understand it, it's probably not worth trying any of this yet, sorry.*