Dictionaries, Encyclopedias, and Digital Libraries

• WorldLingo
  List of free online dictionaries

Grammar

• Arabic Learning Resources
  Arabic grammar lessons
• Arabic Online Reference Grammar
  A short reference for Arabic syntactic, morphological and phonological rules

Vocabulary

• English-Arabic Vocabulary Quizzes
  A collection of multiple-choice quizzes for beginning learners.
• Memrise
  Basic vocabulary practice
• Arabic Learning Resources
  Thematically ordered vocabulary lists
• Learn 101 - Arabic
  Introductory vocabulary with audio files
• Arabic flashcards
  Flashcards with audio files

Reading and Writing

• Omniglot
  Introduction to the Arabic writing system
• The Art of Arabic Calligraphy
  Demonstrates various styles of Arabic calligraphy
• Arabic Calligraphy
  Facebook page

Listening and Speaking

• Learn Arabic on Speak7
  Arabic phrases with audio, reading exercises and assessments
• Aswaat Arabiyya, University of Texas, Austin
  Videos with comprehension questions and classroom activities
• Arabic in Jordan
  Beginners' vocabulary and phrases with audio and video files (Palestinian dialect)
• CERCLL
  Short videos of native speakers of Arabic speaking about a particular topic
• Urban Arabic
  Series of videos teaching basic conversational phrases 

Online Course Materials

• The Arabic Language
  A collection of resources for Arabic learners
• Fun With Arabic
  An online course in Arabic
• Gulf Arabic
  Lessons on spoken Arabic
• PeaceCorps Moroccan Arabic Course
  Downloadable manual with audio recordings
• Arabic Language Through Dialogue
  Online textbook with beginning, intermediate and advanced lessons
• Madinah Arabic
  Online lessons in writing, vocabulary and grammar
• PeaceCorps Jordan
  Pre-departure Arabic language materials
• FSI Course Materials in Arabic
  Links to language learning materials developed by the FSI

 News and Media

• BBC in Arabic
• Al-Jazeera
• Arabic newspapers

Social Media

• Learning Arabic Facebook group

Search Engines

• Lebmania
  Lebanese portal and search engine.
• Sudanese Online
  Sudanese search engine and directory by Sudanese Online in English.
• Winoo
  Tunisian portal and search engine in french language offers a wide range of services.