Link to RMS Express (successor to Winlink software).
This allows digital exchange of ares messaging on HF with a sound card interface (using WINMOR) instead of a high priced pactor hardware interface.
Both the client software (RMS Express) and the WINMOR sound card interface program are available from the download area of the site. Also available are a few .pdf's on setup, configuration and use of the software.
Links
[1] http://www.winlink.org/
[2] http://www.ve3nbc.ca/category/web-links/amateur-radio-emergency-services
[3] http://www.ve3nbc.ca/category/operating/nets