Alphabet

Arabic script writing videos.
Interactive Arabic alphabet chart
Type Latin letters to transform word into Arabic letters.
Type Latin letters into the search bar which are converted to Arabic letters, including spell correction.
Introduction to Arabic short vowels.
Add tashkeel (diacritical marks) to Arabic text.
Calligraphic styles of the Arabic script.
Website of calligraphicist Omar Uddin
Alphabet with pronunciations.
IPA for Arabic letter pronunciation.

Dictionary/Vocabulary

Free online Arabic/English
English -> Arabic, includes diacritics.
Translate into/out of Arabic.
List of English words derived from Arabic.
English terms derived from Arabic.
Arabic word lists (list of 100 up to 2000 words for subscribers); including diacritics.
Quiz for 80% of the words in the Quran.
Arabic terms with audio.
Brief list of Arabic roots.

Grammar

Discussion of Arabic verb forms.
Understand Arabic in just 12 Coloured Tables!
A guide to Arabic Prepositions for Non-Native Speakers by Yaman Hussein.
Place adverbs.
Verb conjugation.
Triliteral roots. KTB: kataba: he wrote, maktab: office, kitaab: book, kaatib: writer.
Wiktionary: Arabic language

Arabic dialects

Variations of the Arabic language.
Arabic dialects.
Levantine and Iraqi arabic.

Wikipedia

Information about the Arabic language and script in Wikipedia articles.

Semitic root K-T-B (such as for kitaab).
Arabic phonology.
International phonetic alphabet for Arabic.
Arabic chat alphabet.
Diacritical marks (such as fatHa).
How to pronounce "al".
History of the Arabic alphabet.
"Pen" in Arabic. Also lists Qalam transliteration and other systems of transliteration.
Transliteration systems of Arabic into Latin alphabet.
Persian alphabet.
Extended Arabic letters for use in other languages
Modern standard Arabic
Different dialects of Arabic.
Arabic grammar.

Youtube

Alphabet by letter name.
Alphabet song pronouncing each letter with each vowel.
Same recording with all letters shown including diacritic vowels.
Urban Arabic 1: Arabic greetings (Hello; 4:12 Good Morning; 6:25 Good Evening).
Pronouncing long and short vowels.
Arabic diacritics (Tashkeel).
Make your own qalam.
Writing with a qalam.
Thuluh calligraphic style letter writing examples.
History of "Arabic numerals".

Books/Courses

Learn Arabic lesson 1
Learn Arabic with Michael (1: the alphabet, initial/medial/final positions)
Wikibook for learning Arabic.
“All The Arabic You Never Learned The First Time Around” by James L Price.
Vocabulary study tool to accompany Arabic textbook, Al-Kitaab.
Five books for learning Arabic.
A New Arabic Grammar of the Written Language by J.A. Haywood.

Music

Lebanese singer Fairouz.
Egyptian pop singer Amr Diab.
Arab Idol 2013.

Radio/News

List of Arabic newspapaers and television stations