Yes, Crio is a research project at Stanford, and is completely free.
Crio currently only supports English. We hope to support other languages in the future.
Yes, support for other websites will soon be made available. You can request a website by using the feedback link on the left of this page or by clicking the Crio icon after installing the extension and clicking the "Request" button.
Probably not in the near future due to limited bandwidth (we're a small team of students). If you want to help us build integrations though, please do reach out.
Please contact us: firstname.lastname@example.org and we'll get back to you shortly. Thanks for helping us improve Crio!