The article examines the developers of courses on Ukrainian platforms of mass open online courses Prometheus, EdEra, Open University of Maidan, their quantitative analysis in various thematic areas. It is noted that education remains the main way to acquire new knowledge and form the necessary competencies. The main advantages of open educational resources, their classification, the reasons for the growing popularity in modern society are highlighted. It was found that mass open online courses are a logical continuation of distance learning courses, have their differences and features. However, some problematic issues related to the promotion of mass open online courses that need to be addressed are considered. An analysis of the number of online courses on Ukrainian-language platforms and their thematic areas. As of March 2020, there are 235 online courses on all considered platforms. The same topics for all platforms were law, training, education, media, economics, health. It was found that the most active developers of online courses on the platform of the Open University of Maidan were public and charitable organizations. Educational online platforms and international organizations are most actively involved in the creation of online courses on the EdEra resource. On the Prometheus platform, the largest number of courses was created at the initiative of international organizations, institutions of higher and secondary education