This really depends on the people who signed up and for which language they ask. The most common languages at a regular AvaLingua Exchange meeting are: Dutch, English, French, German and Spanish.
Arabic, (Brazilian) Portuguese, Mandarin, Italian and Russian are also spoken quite often. Now and then we can offer you: Swedish, Tigrinya, Japanese, Norwegian, Hindi, Polish, Bahasa, Hungarian, Czech, Farsi, Urdu, Romanian, … 🙂
Which languages are spoken during a meeting?