Note: Some of these links require you to Login to the Cisco web site.
Additionally, unless you are a service contract owner, Cisco bars you from using
many of their useful tools.
  Cisco Configuration Tool
  Cisco IOS Software Information
  Cisco IOS Software - How to choose IOS software
  Cisco IOS Software - Installation & Upgrade Procedures
  Cisco IOS Software - IOS Configurator
  Cisco IP Subnet Calculation & Design
  Cisco Network Management Software
  Cisco Networking Academy Program
  Cisco Networking Academy - Login
  Cisco Networking Professionals Connection
  Cisco Packet Magazine
  Cisco Password Recovery Procedures
  Cisco Product Documentation
  Cisco TAC Webinars
  Cisco Technical Assistance Center (TAC)
  Cisco Visio Stencils