Network Utilities (Online)

IP Location Finder
https://tools.keycdn.com/geo

Online Interface for Dig:
https://www.digwebinterface.com/

Google Apps Dig Tool (TXT)
https://toolbox.googleapps.com/apps/dig/#TXT/

Google Apps Dig Tool (ANY)
https://toolbox.googleapps.com/apps/dig/#ANY/

DNS Propagation Testing
https://www.dnspropagate.com/

WhatsMyDNS Global Propagation Checker
https://www.whatsmydns.net/

MXToolbox
https://mxtoolbox.com

Monitoring/Status Pages

Down for Everyone or Just Me
https://downforeveryoneorjustme.com/

Down Detector
https://downdetector.com/

Helpful Technical Articles

Linux Directory Structure
https://www.howtogeek.com/117435/htg-explains-the-linux-directory-structure-explained/

Understanding Group Policy Order (LSD OU)
https://4sysops.com/archives/understanding-group-policy-order/

How to Send Text Messages from Email
https://www.reddit.com/r/ProjectFi/comments/anaw3n/sms_via_email_on_google_fi/

Git Basics
https://www.sqlservercentral.com/articles/basic-git-for-dbas-getting-started-with-git?preview_id=3757585

Tutorial On Creating User Directories and Mapping Drives
https://www.terminalworks.com/blog/post/2017/12/28/windows-file-server-2016-map-network-drive-for-users-and-group-drive-using-gpo1

TechRepublic Articles on Resource Monitor (Old but still helpful)
https://www.techrepublic.com/blog/datacenter/use-resource-monitor-to-monitor-storage-performance/
https://www.techrepublic.com/blog/datacenter/use-resource-monitor-to-monitor-cpu-performance/
https://www.techrepublic.com/blog/the-enterprise-cloud/use-resource-monitor-to-monitor-network-performance/
https://www.techrepublic.com/index.php/blog/the-enterprise-cloud/use-resource-monitor-for-memory-monitoring/

Tutorials and Technical Articles by John Savill
https://savilltech.com/

Calculators and Converters

Data Transfer Calculator
https://www.omnicalculator.com/other/data-transfer

Linux/UNIX Permissions Calculator
http://www.permissionscalculator.com/

DPI Calculator
https://toolstud.io/photo/dpi.php

Convert URLs to Hyperlinks
https://www.hyperorg.com/misc/ConvertURLsToLinks.html

Online Tool to Convert URLs to HTML Links
https://www.commontools.org/tool/convert-url-to-link-22

Title Case Converter
https://titlecaseconverter.com/

ImageColorPicker: Pick Your Color Online
https://imagecolorpicker.com/

Security Sites and Tools

VirusTotal
https://www.virustotal.com/

SANS Newsletters
https://www.sans.org/newsletters/

US CERT Mailing Lists
https://us-cert.cisa.gov/mailing-lists-and-feeds

UpGuard Cybersecurity & Risk Management Blog
https://www.upguard.com/blog

CNET Security
https://www.cnet.com/topics/security/

CSO Security News
https://www.csoonline.com/

Schneier on Security
https://www.schneier.com/

Krebs on Security
https://krebsonsecurity.com/

CISA.GOV list of free cybersecurity sites and tools:
https://www.cisa.gov/free-cybersecurity-services-and-tools

Interesting Discussion of Password Length
https://security.stackexchange.com/questions/171816/whats-the-best-length-for-randomly-generated-passwords-security-vs-compatibi

Why BJ Fogg and Daniel Kahneman Are Big Security Pro Must-Knows
https://blog.knowbe4.com/why-bj-fogg-and-daniel-kahneman-are-must-knows-for-every-network-security-pro

Tools, Utilities, and Freeware

Skwire Empire Freeware
https://www.dcmembers.com/skwire/software/
(sChecklist is a case study in elegant simplicty!)

Nirsoft: Utilities by Nir Sofer
https://www.nirsoft.net/

Sysinternals
https://learn.microsoft.com/en-us/sysinternals/

PortableApps
https://portableapps.com/

Tools for Writers and Other Curious People

How Many Syllables
https://www.howmanysyllables.com/

Visual Capitalist: Making the World's Information More Visible
https://www.visualcapitalist.com/
https://www.visualcapitalist.com/mercator-map-true-size-of-countries/

Microsoft 365 Pages that Are Annoyingly Difficult To Find Even Though the URLs Are Easy

The Microsoft 365 Message Quarantine:
https://security.microsoft.com/quarantine

Microsoft My Sign-ins Page:
https://mysignins.microsoft.com/

Essential Essays

Programming Sucks
https://www.stilldrinking.org/programming-sucks

Joel Spolsky: User Interface Design for Programmers
https://www.joelonsoftware.com/2001/10/24/user-interface-design-for-programmers/