OpenVR for VR hardware under linux, windows and osx.

Is working with windows 64/32, linux 64 and osx 32. The github tells us about this development:

OpenVR is an API and runtime that allows access to VR hardware from 
multiple vendors without requiring that applications have specific 
knowledge of the hardware they are targeting. This repository is an SDK 
that contains the API and samples. The runtime is under SteamVR in Tools 
on Steam.
Documentation for the API is available in the wiki: 
https://github.com/ValveSoftware/openvr/wiki/API-Documentation
More information on OpenVR and SteamVR can be found on  

http://steamvr.com

Defold Engine with editor and lua scripting.

The new game engine come from Defold Engine and was released 31. May 2016.

The Defold is a cross platform 2D focused Lua powered game engine created by King and available for free. If you want to learn Lua programming language or you know this programming language, then is great.
About Lua:  is a powerful, efficient, lightweight, embeddable scripting language. It supports procedural programming, object-oriented programming, functional programming, data-driven programming, and data description.
This game engine brings improved editor performance on OSX, Windows, Linux 32 and 64 with  GUI layer counts. It's working with your google account.
You can also have online tutorials.
This improved account management options, including the ability to delete your account if required. You can see the official playlist with some video tutorials: