JSesh is used and supported by the IFAO .
JSesh is featured on sun's swing sightings previews 23!
This tutoriel explains how to combine existing signs from the JSesh fonts in order to create new ones.
It gives examples of rather advanced manipulations of the glyphs.
(Note that I no longer include the SVG files as a zip file, although it can rather easily be found in JSesh library. The system is simpler: Just type the signs you need in JSesh, select them, and "export to SVG").