This is a FTP server (based on a very old PHP code I found) that exposes the Moodle filesystem
Using Filezilla (or any FTP client) you will be able to browse the Moodle filesystem (as you did in Moodle 1.9) and download files
Uploading files it supported, but allways are saved in your private area in Moodle
It uses WebServices for accessing the Moodle filesystem, so one interesting feature is that you can run the FTP server in your local computer or any computer in Internet
It doesn't require you to install anything in your Moodle, it works just running the FTP server and login with your user credentials (of course, you have to apply some settings in your Moodle)
For having a software suitable for production sites we will have to wait for Moodle 2.3 and the file handling improvements and also for fixing some WS bugs and issues
So, right now, you can use it for playing
https://github.com/jleyva/moodle-mftpd/zipball/master
See the README file
Note: If you review the code, remember, this is a proof of concept