SharePrep 5.01.161 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. SharePrep is included in System Utilities.
This tool was originally designed by Assistance & Resources for Computing Inc. We recommend checking the downloaded files with any free antivirus. SharePrep.EXE is the most frequent filename for this program's installer. The following versions: 5.0, 2.0 and 1.6 are the most frequently downloaded ones by the program users.
From the developer:
SharePrep is a special-purpose utility program for SharePoint that you can use to correct file and folder names in preparation for importing data into Microsoft's SharePoint Server and MOSS. The folder and filenames within SharePoint have more restrictions than for normal Windows operation. These restrictions are for both special characters and length of the file names and folder names.
You may want to check out more software, such as AJC Directory Synchronizer, Rapid File Defragmentor or Diskeeper Server Enterprise Edition, which might be similar to SharePrep.