VuFind's Koha driver was written for version 3.02; I believe it has been tested successfully with newer versions, but I don't know all the details.  If there have been significant changes to the Koha database schema, some adjustments might be needed.  Similarly, the Evergreen driver was written some time ago, and I'm not sure how widely it has been tested.

Regarding the Arabic language, you should be able to add support by creating a new language file.  Some details are provided here:

http://vufind.org/wiki/language_localization_support

Some template adjustments may be needed to fully accommodate right-to-left text, but if you are willing to tolerate some minor display imperfections, it may not be a difficult process.

I hope this is helpful, but please let me know if you still have questions.

- Demian

From: Nisreen Kabani [n.kabani.sy@gmail.com]
Sent: Sunday, October 21, 2012 12:48 PM
To: vufind-general@lists.sourceforge.net; vufind-tech@lists.sourceforge.net; vufind-unicorn-l@lists.lehigh.edu
Subject: [VuFind-Tech] Arabic language

Hello

I am in the process of preparing for the project is to create a unified catalog for several libraries through the  Vufind system
My question
Does the Vufind  system support all versions of a Koha system or Evergreen system supports certain versions? What?
The second question
 is I know that the system does not support Arabic language as a front? But supports recordings in Arabic? How can Syndication and interfaces?

Please help me
Thank you very much