What models are available in the Inference API?

I am just getting started with Huggingface and have a very basic question about the Inference API:
Is it possible to use any model on Huggingface with the Inference API or only the ones listed under Detailed Parameters in the api-inference.huggingface.co/docs?

If all are available, but only some have documentation in the docs, where do I learn about how to use some of the undocumented onces? For instance a model like microsoft/trocr-base-handwritten · Hugging Face or First Order Motion Model - a Hugging Face Space by abhishek?

Hope my question makes sense :slightly_smiling_face:

Would anyone have a answer to this question?