Communities

• #misec – Michigan Security Community. Slack
• Open Web Application Security Project (OWASP) (OWASP Detroit)
• Converge Conference (@convergedetroit)

Bug Tracking and Vulnerability Databases

• SecurityFocus
• NIST – National Vulnerability Database
• Exploit Database
• Rapid7 Vulnerability and Exploit Database
• WPScan Vulnerability Database

Cheat Sheets

• PacketLife.net (Protocols, Applications, Reference, etc.)
• Zelster.com (Writing Tips for IT Professionals, Tips for Creating a Strong Cybersecurity Assessment Report)
• Open Web Application Security Project (Github: OWASP Cheat Sheet Series)

Traffic Analysis

• Malware-Traffic-Analysis Since the summer of 2013, this site has published over 1,600 blog entries about malicious network traffic.  Almost every post on this site has pcap files or malware samples (or both).
• PacketLife.net Packet captures

Professional/Blog Resources

• Daniel Miessler
• Black Hills Information Security
• Krebs on Security
• Schneier on Security
• Graham Cluley
• Paul’s Security Weekly

Mobile Application Penetration Testing

• Android Emulator (Genymotion)
• Mobile Security Framework (MobSF)