Perhaps the most common method of digital communication used by Amateurs and ARES will be FL-Digi and it’s associated programs.
The software is free and available for download at SourceForge:
https://sourceforge.net/projects/fldigi/files/
ARES users may need FL-MSG to send forms, this program is available there too.
This presentation is a good starting point for using FL-Digi with ARES.
NBEMS for Emergency Communications – PowerPoint PPT Presentation
http://www.scottares.org/images/NBEMS11May2012.pps
FL-Digi also supports WEFAX
WEFAX (Weatherfax, HF-FAX, Radiofax, and Weather Facsimile) is a slow scan image transmission mode used for weather charts, press images, newspapers, and meteorological reports.
WEFAX was originally developed for satellite but has gained usage in the HF bands.
Gateway Amateur Radio Club 