Yup, if you have a floppy disk on your PC you can write back almost any Atari ST disk. The hard work was done by Simon Owen who created the floppy disk kernel driver.
http://simonowen.com/fdrawcmd/The Atari front end (Floimg) is written by ppera, unfortunately he has decided that because of a few arguments with fellow AtariST community members to withdraw into his own little world.
http://ppera.07x.net/atari/
