Links to general operating aids and specific operating modes
Home page for JT-65 and it's related modes and software interfaces
This link to the ARRL site provides audio recordings of selected digital modes to assist in identifying a digital signal on the bands.
Listing of Digital software packages and the modes they support.
Description of digital modes.
Description of Ham Radio Deluxe DM-780 features.
CHIRP is a free, open-source tool for programming your amateur radio. It supports a large number of manufacturers and models, as well as provides a way to interface with multiple data sources and formats.