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Cocoa reads and write RTF - but ignores the writing direction.

For example, you can set writing direction in a NSMutableParagraphStyle:

[paraStyle setBaseWritingDirection:NSWritingDirectionRightToLeft];

Then you can add this paragraph style to a NSTextStorage. But it will not save this attribute when you write RTF from it.

Anybody knows of open source/gnu good RTF code?

You might check GnuStep. – RobRix