Excellent software for disk defragmentation.
Catalogs audio CDs, floppy disks, hard drives and directories.

Utility for PDF documents that allows you to merge, split, group, protect, clean metadata, insert and extract pages.
Software that allows you to remove passwords and restrictions from PDF files.
Permanently delete files with a single click.
Practical and lightweight utility developed to calculate and verify cryptographic hashes of files, such as CRC-32, MD5, SHA-1, SHA-256, and SHA-512.