I used to feed a wxfax system with charts in the Pacific (in my younger days as a Navy weatherman.) A quick search of the NWS marine radiofax web page yielded the following which may be useful in your search for s/w.
Dedicated radiofax hardware is available from Alden, Furuno, Japan Marina Co. Ltd, JRC, STN ATLAS Marine (SAM) Electronics, and Universal Radio. --> Available radiofax software programs include (in alphabetical order) ACfax(LINUX), Board Terminal, Code300-32, cocoaModem 2.0 (MAC OS X), Easyfax110(DOS), GetFax, HamComm 3.1(DOS), HamFax(LINUX), HF Weather FAX (iPhone/iPad/Android), JVCOMM32, JWX, Meteofax32, MixW, MFJ-1214PC, MSCAN, MultiFax, Multimode (MAC), MultiPSK, PC HF Facsimile 8.0 For Windows , PC GOES/WEFAX, PC Radiofax for Windows, ProMeteo, RadioCom, SeaTTY, SkySweeper, WeatherFax, Weather Fax 2000, WeFax for Windows , WiNRADiO Digital Suite, WinSkan, WxImageApplications, and WXSat. Also see the Worldwide Radiofacsimile Webpage for listings of available equipment and software as well as information on radiofax services available worldwide.
Many radiofax software programs are also capable of copying National Weather Service marine text forecasts broadcast by the U.S. Coast Guard using HF SITOR/NDBP. CLICK HERE for details.