Free university courses for all, from 26 institutions of the world, without registration and without a limit on the number of courses, is offered by the OpenCourses.gr online platform

It is a collection of university courses at both undergraduate and postgraduate level covering a wide range of subjects, from humanities and social studies to science and technology. The courses, which are divided both by institution and by subject area, are aimed at all those who wish to broaden their knowledge.

You can view the course modules online or, alternatively, download or print them.

Some courses are also offered in the form of recorded lectures by the teaching professor. The completion of a course is not accompanied by a certification.

The opencourses.gr platform is offered by the Academic Internet (GUNet), a body supervised by the Ministry of Education, Research and Religious Affairs, an association in which all the country’s institutions participate.

You can search for available undergraduate and postgraduate open courses of your interest at opencourses.gr, the National Open Course Search Portal, which was designed and implemented by the Academic Internet (GUnet), in order to support Open Digital Courses (ODC) provided by Universities and TEI’s around Greece. Search for the open course you are interested in by institution, by subject area or using “keywords” and once you find the one you are interested in, in the course ID on the right side of the screen, select “Visit the course”.

Alternatively, if you are interested in open courses offered by a particular HEI, you can visit the respective institutional open courses website directly. See the detailed list of educational institutions that offer open courses.

You can read more here.