Data Science
Data Wrangler, Stanford Visualization Group - http://vis.stanford.edu/wrangler/
Cybersecurity
Wireshark - https://www.wireshark.org
Suricata - https://suricata.io
tcpdump - https://www.tcpdump.org
Autopsy - https://www.autopsy.com
VirusTotal - https://www.virustotal.com/
Jotti malware scan - https://virusscan.jotti.org
urlscan.io - https://urlscan.io
CAPE Sandbox - https://capesandbox.com/analysis/
MalwareBazaar - https://bazaar.abuse.ch/browse/
Security Information and Event Management (SIEM) tools
Splunk - https://www.splunk.com
Google Chronicle - https://chronicle.security
Linux Distribution
Kali Linux - https://www.kali.org
Others
Infographics (Google for Developers) - https://developers.google.com/chart/infographics/docs/infographics_gall