These are the services that DoDropIn members use and recommend
QRZ
QRZ is an all-in-one service for Hams. Want to read radio reviews, QRZ. Want to look up a call sign, QRZ. Want to check on your license, QRZ. It features extensive discussions on all things ham. It’s worth putting some time into your Bio on QRZ, that’s your calling card to the entire Ham universe. If you use a product like Netlogger you might want to consider signing up for a membership, they have a portal for their lookup service that works with all sorts of third party software.
RadioReference.com
Need to find all the repeaters in your area, or in your next destination’s area? RadioReference.com. A huge data base of all repeaters that can be searched with a click to reveal something as specific as “all fusion enabled repeaters within 25 miles of Saint Martin.” A must have for scanner riders and hams on the move. Really handy for new hams, to see just how deep the pool is.