HXTT Checksum Tool for MD5 is a free toolkit for MD5 (Message Digest 5). That freeware should work on any platform that supports Java.
RiMD5 is an small freeware utility for calculating the MD5 (Message Digest number 5) checksum values of specified files.
MalwareBytes
Removes even the most stubborn malware.
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Well-known free antivirus protection software.
WinZip
WinZip is the world's #1 zip utility.
Download Manager
Free download manager & internet accelerator.