An (alpha) SFTP command line client is included. On Chrome OS, you can create SFTP mounts and access them from the Files app!
If you are using Chrome OS, this is the App version for you. All other platforms should use the extension version instead. The extension version can be found here:
https://chrome.google.com/webstore/detail/iodihamcpbpeioajjeobimgagajmlibd
It has been well tested for a couple of years.
Please read the FAQ, available here: https://goo.gl/muppJj.
You can also exchange feedback in the chromium-hterm mailing list, available here: https://goo.gl/RYHiK.
The changelog is available here: https://goo.gl/YnmXOs