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Today I am excited about:
LÖVR is a open source, VR game engine made by Bjorn Swenson. As of today version 0.13 is released:
And, of specific interest to me, this is the first version to officially support Oculus Quest!
https://lovr.org/docs/Getting_Started_(Android)
LÖVR is the basis for the commercial game I've been making for the last year and a half. I maintain LÖVR's Oculus Mobile port, plus this repo (forked from my game) of helper classes and tools:
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
It makes me happy that I can write a dozen lines of Lua, type "adb push --sync" and my dozen lines of Lua are suddenly running on an untethered VR headset. This is good to me.