The Encyclopedia Judaica is a massive, expensive, respected reference work. Immediately upon looking up a word in the new Internet edition, I recognized the contributor who wrote the article: Yigael Yadin, famous Israeli leader and archaeologist. The entire work has been made available for free online by the generous donation of the couple you’ll see when you click here.
Update: Numbers of people come to my blog by searching for “Encyclopedia Judaica Free Online.” I’m sorry to have to inform you that that generous couple didn’t realize they were giving something away to the entire world. The site now reads, “Please note that the password is only available to members of Austin’s Jewish Community.”