Arabic Almanac
Perhaps the most valuable project out there, the Arabic Almanac is a collections of scanned dictionaries that are searcheable by roots. The Almanac uses the Mawrid Reader, an extendable HTML/JavaScript app for both desktop and mobile use for displaying and searching books. The Almanac can be downloaded to your hard disk or smart phone’s SD card, for fast offline usage.
The Mawrid Reader makes the Arabic Almanac infinitely extendable and over the past few years the number of included dictionaries was significantly increased. As of March 2012, the project includes 31 dictionaries: Arabic-English (10, including such indispensable titles as Hans Wehr, Lane, Steingass, Hava, etc.), Arabic-Urdu (7), Arabic-Arabic (9), Arabic-Indonesian/Malaysian (4), and Arabic-French (Kazimirski).
Detailed description of the project
Developers: ejtaal.net
URL: ejtaal.net/aa/