www.tolueislam.com/Parwez/expo/expo_glossary.htm (Arabic-English)

Lughaat Al Qur'an - by G.A. Parwez (English translation: Word doc or PDF)

www.emuslim.com/quran/lughat.asp (English, Urdu, Bengali)

www.muhaddith.org/lexicons.html (Arabic & English)

Lisan al-Arab, Taj al-Arus, Qamus al-muhit

Lisan al Arab free download (right click, save as)

Lisan al Arab, al Qaamuus al Muheet, Maqaayees Allugha, al Sahaah fil lugha and al AAbaab al Zaakhir

al-Mufradat fi Gharib al-Quran by al-Raghib al-Asfahani (scribd link)

The earliest Classical Arabic Dictionary: Kitab al Ayn

Hans Wehr (Modern Standard Arabic dictionary)

Dictionary of Holy Quran by Abdul Manan Omar (also with grammar information)
islamusa.org/dictionary.pdf (PDF right click, save as)

Arabic-English Dictionary of Quranic usage (pdf)

E.W. Lane's Arabic-English lexicon FREE online PDF

E.W Lane's Lexicon - viewable online (or HERE with word search)

E.W. Lane's Arabic-English lexicon (small files, for slow connections only)

Lane's Lexicon for Mobile Phones:http://ejtaal.net/m/ll