Employment:

Search here for job listings to verify that an employment opportunity is legitimate.  

Test files for viruses:

VirusTotal is a free service that analyzes suspicious files and URLs and facilitates the quick detection of viruses, worms, trojans, and all kinds of malware.  If you downloaded or notice a questionable file on your computer, use this site to upload that file to be tested.

Free anti-virus & computer network software:

These companies provide free up-to-date anti-virus software.

Ad-Aware Free Antivirus+
Avast Free Antivirus
Avira Free Antivirus
Microsoft Security Essentials Download
AVG Free antivirus
OpenDNS Family Shield

Web Sites with online testing tools:

Scan computer for viruses and Malware: Many computer security vendors offer free computer security checks for your computer. Visit a link below to check your computer for known viruses, spyware, and more and discover if your computer is vulnerable to cyber attacks.

Bitdefender
ESET Online Scanner
McAfee Security Scan
Microsoft Safety Scanner
Panda Security Antivirus Scan
Qualys Browser Check
QualysGuard Malware Protection
Sophos Free Security Tools 
Trend Micro HouseCall Virus Scan

Test the safety of a website:

Several organizations offer free on-line tools for looking up a potentially malicious website. Some of these tools provide historical information; others examine the URL in real time to identify threats:

BrightCloud URL/IP Lookup: Presents historical reputation data about the website
Cisco SenderBase: Presents historical reputation data about the website
FortiGuard lookup: Displays the URL's history and category
Is It Hacked: Performs several of its own checks of the URL in real time and consults some blacklists
IsItPhishing: Assesses the specified URL in real-time
KnownSec: Presents historical reputation data about the website; Chinese language only
Norton Safe Web: Presents historical reputation data about the website
PhishTank: Looks up the URL in its database of known phishing websites
Malware Domain List: Looks up recently-reported malicious websites
MalwareURL: Looks up the URL in its historical list of malicious websites
McAfee Site Advisor: Presents historical reputation data about the website
McAfee TrustedSource: Presents historical reputation data about the website
MxToolbox: Queries multiple reputational sources for information about the IP or domain
Reputation Authority: Shows reputational data on specified domain or IP address
Sucuri SiteCheck: Scans the URL for malware in real time and looks it up in several blacklists
Trend Micro Web Reputation: Presents historical reputation data about the website
Unmask Parasites: Looks up the URL in the Google Safe Browsing database
VirusTotal: Looks up the URL in several databases of malicious sites
WebPulse Site Review: Looks up the website in BlueCoat's database
Zscaler Zulu URL Risk Analyzer: Examines the URL using real-time and historical techniques