Websites

Reference

Huge Reference Site

Networking

Internet

Internet Health Report

Active Internet Attacks

Down Right Now

Down For Everyone Or Just Me?

HTML 5 Internet Speed Test

Internet Testing Tools

Network Tools

Network Tools 2

Network Tools 3

Are My Ports Open?

Cisco

CISCO .PCF Decoder

Cheatsheets

Various Cheatsheets

Browsers

Plugins

Adobe Flash Version Check

Java Version Check

Silverlight Version Check

System Administration

2014 Ultimate Developer and Power Users Tool List for Windows

Windows Sysinternals

Changing a Name in Server & Exchange 2003

Mail

folder and calendar sharing

Toolbox

MX Toolbox

Blogs

MSPS

MSP Mentor

Other

Lifehacker

Third Tier

Virus Total

xbootmgr how-to

Toolbar and Junk Software Removal

Adobe Flash Network Install

Link Server Fixes

Virus & Malware removal guide

System Diagnostics

Forums

superuser

serverfault

technet

spiceworks

bleeping computer

Malwarebytes

/r/sysadmin

VMWare

Resize Virtual Disks

Virtualization Blog

Linux

Top 5 tools every Linux server should have