Yep. http://www.android.com/filetransfer/

It's essentially a very basic gui that looks a bit like a Finder window from the 1990s which wraps around the open source libmtp and libusb libraries to provide support for a closed protocol developed by Microsoft for the Zune and the PlaysForSure devices.

Google seem to have extended at some point too. It's obviously just the sort of thing Apple would be more than keen to support.

There's also a PTP protocol for photos that cameras and iPhoto/Aperture etc use but that doesn't seem to work well either on the Jolla .