Thanks. I always forgot about caffe2 when talking about pytorch. I couldn't anything for JavaScript and mobile seems not as good supported as TF but for sure they will improve.
Have you actually used TFLite? It's slow as molasses. Deploying on mobile is a bit of a shitshow across the board right now, from what I undertand. Not all models are supported out of the box (especially with ONNX), and the ones that are supported aren't guaranteed to have acceptable performance with off-the-shelf frameworks. Documentation is very sparse as well, especially for the quantized stuff.
Not something I've used myself, but supposedly yes.