kriztalz.sh
An online tool that displays your mtr / traceroute / flyingroutes output on a map for visual analysis.
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md5.gromweb.com
Reverse MD5 lookup service for checking whether an MD5 hash matches known plaintext.
malpedia.caad.fkie.fraunhofer.de
Malware knowledge base with actor, family, sample, and reference information for researchers.