ARRL: The National Association for Amateur Radio
SNJ ARES Google Hangout an instant messaging style discussion group for SNJ ARES information and questions.
SNJ SCERN Groups.io group for anyone with an interest in SNJ's SCERN DSTAR system.
Link to K4REF YouTube channel with great vids on NBEMS and Winlink.
AJ3DI's presentation on Linux in the Ham Shack