Greek Language: Online Courses, Hellenic Cultural Centre

Information here (fee paying courses)

"Courses are held through the electronic online educational platform Moodle and the educational platform GLOSSA, where all relevant learning materials are uploaded (texts, exercises and activities for all language skills, library) as well as through synchronous Skype meetings".

Also of interest, online courses from the Paideia Institute 

"Telepaideia courses are taught online using Google Hangouts. To participate profitably, you will need Gmail address, a high-speed internet connection, a personal computer with a working microphone, headphones or a headset, and a quiet place to work. Participation from noisy public public places like coffee shops is not permitted because it can distract other participants and the teacher".