Qisas an-Nabiyeen 

al-Muntakhabaat

Online Dictionaries

Arabic - English 

Hans Wehr: one of the simplest and most basic dictionaries

Al-Mawrid

Arabic Student's Dictionary.com

Lanes Lexicon Option 1: one of the most detailed Arabic to English dictionaries available. 

Lanes Lexicon Option 2: 

Arabic to Arabic 

Alma'any

Arabic Lexicon

Doha Dictionary of Historical Arabic

Arabic to Urdu

Qamoos al-Waheed. This is also available on the Google Play Store.