Links

General:
Amazon Display IP Address
Passmark CPU Benchmarks
Dell Service Tag Lookups
Netcraft What’s that site running report
WFetch (Microsoft) [Download link]
NirSoft Utilities
URL Decoder/Encoder
Ultimate Developer and Power Users Tool List for Windows
Check to see if Compression is enabled on your website
Online IP Subnet Calculator
Network Tools
Lookup MAC Address
Site Built With…
Check if site is mobile friendly
Test my site with Google
IP Lookup
Internet Storm Centre

HT Access Tools
htaccess tester

See how a website appears from different countries

Reference:
HTTP Response Codes
Steve Gibson’s Port Database
SMTP Reply Codes

Passwords:
Steve Gibson’s Password Generator
LastPass password generator

Email:
Check Blacklists
SenderBase (Cisco) Reputation
SPF Wizard
Email Questions – SPF Wizard
Dynu SPF Generator
Mail Radar SPF Wizard
SPF Validator
SPF Syntax Validator

POP3 Tester
DKIM Checker
Microsoft Remote Connectivity Analyser

DNS:
Down for everyone – or just me?
Robtex DNS Mapper
DNS Propagation Check
DNS Checker
WhoIs (AU)
Central Ops DNS checker (and more…)

CSR/SSL:
Digicert CSR Generator (creates the necessary commands)
CSR Decoder
SSL Analyzer 

SSL Site Check
SSL Converter
How do I create a P7B file for a certificate?
SSL Server check (Qualys)
TLS Tests (email)

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