RESOURCES

USPS Home Page
Contains Quick Tools for Track & Confirm, Calculate a Price, Look Up a Zip Code and Find a Location.
Track & Confirm
Zip Code Lookup
Buy Stamps
Get Mailing & Shipping Supplies
Pricing
Mail Service Update
Provides real-time mail service updates to make mailers aware of service suspensions at Post Offices for any reason including natural disasters, such as floods or fires

FedEx Home Page
Contains Quick Access to Create a Shipment, Schedula a Pickup, Order Shipping Supplies, File a Claim on a Package and Track a Shipment.  Most require logging into an account.
FedEx Tracking

UPS Home Page
Contains Tracking, Create a Shipment, Calculate Time and Cost, Schedule a Pickup and Order Supplies.