Encrypt PDF SDK-COM allows you to encrypt (using standard 40-bit or 128-bit supported by Acrobat Reader 5.0 and up) existing PDFs.
MalwareBytes
Removes even the most stubborn malware.
Spam Bully
Spam Bully can eliminate up to 99% of spam.
AVG Anti-Virus
Well-known free antivirus protection software.
WinZip
WinZip is the world's #1 zip utility.
Download Manager
Free download manager & internet accelerator.