General Webint Tools and Toolkits:

Central Ops http://centralops.net
Domain Tools https://www.domaintools.com
DShield API https://isc.sans.edu/api
Gaijin.at https://www.gaijin.at/en/tools
HackerTarget https://hackertarget.com/ip-tools
_IntelligenceX https://intelx.io
Kloth http://www.kloth.net/services
Maltego https://www.maltego.com
Many Tools https://manytools.org
Mitaka https://chrome.google.com/webstore/detail/
mitaka/bfjbejmeoibbdpfdbmbacmefcbannnbg |
https://addons.mozilla.org/en-US/firefox/addon/mitaka |
https://github.com/ninoseki/mitaka
MXToolbox https://mxtoolbox.com
Network Tools http://network-tools.com
NirSoft http://www.nirsoft.net
RiskIQ https://community.riskiq.com
Robtex https://www.robtex.com
Security Trails https://securitytrails.com
Sputnik https://chrome.google.com/webstore/detail/
sputnik/manapjdamopgbpimgojkccikaabhmocd |
https://addons.mozilla.org/en-US/firefox/addon/sputnik-
osint | https://github.com/mitchmoser/sputnik
Spyse_ https://spyse.com
ViewDNS https://viewdns.info
Web Wiz https://network-tools.webwiz.net
You Get Signal http://www.yougetsignal.com