HP Hewlett Packard

Crucial DRAM Scanner

HouseCall Virus Scanner

PC PitStop Scanner (IE Only)

SpeedTest.NET

PingTest.NET

YouTube 27 Hour Timer

Google Virus Total

BitDefender Online Scanner (admin)

https://security.symantec.com/

Down For  Everyone or Just ME

MajorGeeks.com Tools

Passwords

PSU Tester

Restore Point

SFC

Re-Install Operating System

Back up + Data Recovery

NirLauncher > MajorGeeks

Keyboard Tester > MajorGeeks

HeavyLoad

Tweaking.com

BlueScreen Reader

Benchmarking Software

Battery Tester / Monitor

Fan + Temp Tester / Monitor

SIW

Microsoft Troubleshooter

Microsoft Sysinternals Suite

Microsoft Surface Diagnostic Toolkit

Hiren's BootCD / Live CD, Free

Ubuntu Live CD / Live CD, Free

UBCD4Win / Live CD, Free > Ultimate Boot CD

Intel CPU Diagnostic Tool

CCEnhancer

WinUtilities
SlimCleaner
Comodo Programs Manager
Should I Remove It?
Auslogics Duplicate File Finder
Duplicate Cleaner
AutoRuns
AppCleaner
System Ninja
Krojam Cleaner
WindirStat
PC Decrapifier

CPU-Z

GPU-Z

Performance Monitor / CPU Time and Usage graph

Reliability Monitor / Overview and problem history

Windows WiFi Analyzer / Graph

Angry IP Scanner  / 

CrystalDiskInfo / HDD Dx

Resource Monitor / DRAM usage overview

Windows Memory Diagnostic

JScreenFix / Stuck pixel fixer

AdwCleaner / simple malware scanner

MalwareBytes 

ClamWin

WinDirStat / Scans drives and details usage by folders and files in a neat tree-based hierarchy and graph view.

NETWORK DIAGNOSTIC TOOLS

Wireshark (FREE)  Network protocol analyzer.

Angry IP Scanner (FREE)

NDT (Network Diagnostic Tool) > Measurement Lab - (FREE)

For the novice and network researcher, this tool provides a sophisticated speed and diagnostic test. Upload and download speeds + provides info for Network Admin to understand what is going on.

Acunetix Online (FREE & PAID)
Network + Website security Checker

SolarWinds WAN Killer (FREE & PAID)

Stress test your network to measure performance

Paessler PRTG Network Monitor (FREE & PAID)
Measures IT infrastructure. From bandwidth to traffic to uptime, and even packet sniffing. View Entire network at a glance since it's easy to use, the UI is beautiful, and again, everything under one roof.

Mr TechBench will help you repair your devices and eliminate your headaches. Mr Tech Bench provides  dependable repairs at affordable prices.