JSesh is used and supported by the IFAO 
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Import pasted RTF doesn't work for "wysiwyg" pictures
Submitted by Serge Rosmorduc on Mon, 09/21/2009 - 20:38.
solved:
solvedPictures copied from JSesh in "wysiwyg" mode, and pasted into openoffice, don't contain the correct information for pasting them back in JSesh. In fact, they are always in Pict format.
Temporary Workaround:
Use the other modes (large and small) ?