Hi, MAPMAN can read and write a number of formats - see:
http://xray.bmc.uu.se/usf/mapman_man.html#H8
While it doesn't write "cube" format, it can produce maps in various ASCII
formats (e.g., NEWEZD, CNS, X-PLOR) that you should be able to convert into
something that suits your needs.
--dvd
