You might be thinking of undelete freeware OS X when the data has been deleted from you Mac system. Sometimes you are in such a hurry that you delete certain files and folders to crate some extra space on the hard drive. You even empty the trash without rechecking the contents of it. You may later realize that you have made a grave mistake as certain important files also get deleted in the process. The undelete freeware OS X can help in this situation but first you must take some precautions like you should not use the drive from where the files were deleted as it will overwrite the disk space on which the deleted file still exist. You can also use any back up that is available to you. But when the back up does not work then the best undelete freeware OS X you can get is Mac data recovery software. It is capable of restoring all the deleted files whichever the file format is like videos, music, pictures, documents etc. This undelete freeware OS X software will scan and show the preview but the recovery can only be done by using the licensed version.