ExtFS is a file format more and more used under Linux. Like NTFS of Windows, this format is not fully supported by OS X.
Now Paragon proposes a total solution making it possible to automatically mount the disks formatted in Ext2 and Ext3 and manages the reading and writing of files in a completely transparent way.
The software with a time-limited demo is available and costs 39,95$.
More:
http://www.paragon-software.com/home/extfs-mac/
[translation by crispin]
