What current (free) tools support exporting to Gltf2?
Currently very few as it’s a very new format. But there are several under dev, including one for blender (sponsored by Kronos) and an online one too.
I am using gltf2 as the built-in/native format as it’s ideal for games – lightweight, fast, open, free etc, with a feature set that matches modern game engines and PBR materials very nicely. I am hoping to be able to support the full gltf2 feature set eventually.
Here’s a bunch of gltf2 WIPS:
https://github.com/KhronosGroup/glTF/issues/867