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You could try out Mellel: http://www.mellel.com/ Apparently it's good at RTL languages which you mentioned you will be using (Arabic, Urdu) and it's cheaper than MS Word etc. That having been sai...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/7969 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You could try out Mellel: [http://www.mellel.com/](http://www.mellel.com/) Apparently it's good at RTL languages which you mentioned you will be using (Arabic, Urdu) and it's cheaper than MS Word etc. That having been said, I use Scrivener, as various others have mentioned; but I haven't had much experience with multi-lingual documents.