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Caryn says she already posted this and didn't see it. Well, I for one did not.
Although I don't use them (would if I could), there are UNIX versions of
several of the better known packages, I understand. Although not incredibly
fancy, I use the illustration package that is part of the Interleaf desktop
publishing software--it is sufficient for importing (and editing) various
kinds of graphics, and for creating diagrams such as directory structures,
flow diagrams and such.