From Smith Micro:
StuffIt incorporates the funtionality of StuffIt Expander, DropStuff, DropZip, and DropTar into one convenient program. Create and access email attachments and downloads, protect data, and transfer files. StuffIt's advanced technology specialized in the compression of M3, PDF, and graphics files with no quality loss. Shrink documents up to 98% of their original size. Use StuffIt to free up space on your computer and to fit more compressed files onto CD/DVDs or other drives. Secure your compressed data with password protection and encryption with strong 512-bit encryption for SITX archives and AES 256-bit encryption for Zip files. StuffIt's automatic archive repair abilities ensure your data's integrity over the long haul. Upload your archives to a network volume or web server with StuffIt's built-in FTP or email file transfers. StuffIt automatically segments large archives to accommodate media storage capacity and to beat e-mail size limits. Send files via email with a single click.