Arabic Opensource Software

Bulletin Board
-phpBB
The world’s most widely used forum creation software, phpBB, lets you set up an online community in just minutes. The latest release, tagged "Olympus," includes the ability to send attachments, create unlimited sub-forums, add custom BBCodes, and many other new features. Operating system: OS independent.

Compression Utility
-7zip
Supports many compression formats like zip,rar,gzip,gunzip

Content Managers
-PHP-Nuke
This content management tool boasts a large, active user community and numerous add-ons. It provides a complete solution for developing a highly interactive Internet or intranet site. Operating system: Windows, Linux/Unix, OS X.
- joomla
One of the most widely used Open Source MCS, it is very open ended system, has huge collection of modules and add-ons. Operating system:Linux/Unix, OS X, Windows.
- ASP nuke
ASP.net CMS for those who use Windows and .NET framework. Operating system: Windows.
- wordpress
Number one blogging system, very easy to use, easy to customize, support many plug-ins. Operating system : OS independent
- Simple Arabic Blog
Simple Arabic Blog is easiest way to manage your personal blog in professional way . This blog didn't need database it use only text with GZIP or without . Easy for install ,just unzip and copy and run then .

Developer Tools
- phpmyadmin
Written in PHP, this utility handles the administration of MySQL over the Web. phpMyAdmin performs many database administration tasks like running SQL statements, adding and dropping databases, and adding, editing or deleting tables or fields. Operating system: OS Independent.
-Arabic PHP Tools
This project is a set of classes that help Arabic programmers (Mostly PHP). The aim is to provide a starting set to solve common problems that Arabic language faces when used in the Web or on Desktop Appplications.
-ABGD HOWAZ Arabic Compiler
This is an Open source compiler for Arabic C-like Syntax.

Education
-moodle
Course management system. Very flexible, rich in features , has lots of modules and plug-ins. Operating System : OS independent

Editors
- AOO
This is the Arabization project for OpenOffice. This project should provide the Arabic end user with at least, the same Arabic support that he founds when using Microsoft Office. The target OS will be Linux, but more platforms will be on consideration.

Islamic
- Quran
The Quran project is aimed to be a comprehensive tool to navigate through texts of the Quran, play readings of selected verses, as well as other features.
- Holy Quran Viewer
A viewer / search utility for the Holy Quran (المصحف العثماني) developed in C# 2.0, using an XML representation of the Holy Quran and providing a search mechanism for the Arabic Language that presents many obstacles for search in particular.
- Quran Page A Day
Read one page of Quran in arabic each day with this simple program. You can do it inshallah! We check our email daily, so it is easy to read for 3 min. Spread the word. never let a day go by without Quran Jazakum allahu khair.

Photo Tools
- gallery2
This Web-based photo album organizer makes it easy to add large groups of photos to a Web site. It allow some basic photo manipulation, such as resizing, rotating, and altering image quality, but does not include advanced photo editing. Operating system: OS Independent.

Tools
-QaMoose
QaMoose facilitates the access to an English/Arabic user-defined dictionary via web access using the DICT protocol.
-Katoob
Katoob is a light weight, multi lingual, BIDI-aware text editor based on the Gtk+ 2 library.
- Sarf
Sarf is an integrated software system (engine) that can generate arabic verbs, derivative nouns, and gerunds, and inflect them, starting from their triple and quadruple roots, depending on the grammar and morphology rules, and using the system database.
- Arabic Spellcheker Word List
Arabic word list for spell checkers (e.g. Aspell).
- uCal - Arabic/English Hijri/Greg Date
The only converter between the Hijri(Islamic) & Gregorian dates, that is 100% compatible with Um AlQura Calendar of Saudi and most of Muslim World. Format Hijri/Greg dates according to PHP:date() standards in Eng/Arabic. Hijri date() & mktime() functions.

Wikis
-mediawiki
Originally written for Wikipedia, MediaWiki allows collaborative editing on documents within a familiar interface. It was designed to be run on a large server farm and requires Apache, PHP, and MySQL. Operating system: Windows, Linux/Unix, OS X.

Many thanks for Geek2Live for his contribution on this list

if you have any software please add in comment to be added to the list