Status of currently operating Satellites
AMSAT Live OSCAR Satellite Status Page
AMSAT Communications Satellites
Satellite Pass Prediction
N2YO.com Amateur Radio Satellites
AMSAT Online Satellite Pass Predictions
Maidenhead Grid Square Sites
Amateur Radio Ham Radio Maidenhead Grid Square Locator Map
SatMatch - SatMatch is a satellite prediction tool used to find times when a satellite is visible from two locations.
NØUK's Maidenhead Grid Distance & Bearing Calculator.
Logging
Lotw - ARRL's Logbook of The World
QRZ - Callsign Database
Clublog - Club Log is a website that allows you to upload your log, generate reports, analyze your progress, and access various DX resources.
APRS
Amateur Radio Stations heard via ISS
Other
POTA - Parks On The Air