Learn Vocabulary with Transparent Word of the Day
This is a free service that sends an email to your inbox once a day with a new word and its definition. It's currently available in
French Spanish Portuguese Italian German Dutch Swedish Norwegian Polish Russian Irish Turkish Hebrew (and a few others which are not taught on Duolingo)
I've been using it for French the last couple of days and so far it seems the vocabulary is a little more advanced. For example, today the word in French was "l'attentat", which means terrorist attack.