The following links may be of interest to researchers in Near and Middle Eastern history and culture:
Jewish date converter
Converts dates in the Jewish calendar to Gregorian ones et vice versa.
Islamic date converter
Converts dates in the Islamic calendar to Gregorian ones et vice versa.
Iranian date converter
Converts dates in the Persian calendar to Gregorian ones et vice versa.
Menalib : Middle East Virtual Library
Al-Waraq : on-line Arabic library
Faculty of Asian and Middle Eastern Studies, University of Cambridge
Centre of Middle Eastern and Islamic Studies, University of Cambridge
Skilliter Centre for Ottoman Studies, Newnham College
British Library : Middle East Collections