The article is devoted to the problem of studying the professional development of teachers of science and mathematics education and technology in the conditions of martial law. The purpose of the article is to characterize open educational platforms for the professional development of teachers of science and mathematics education and technology. These platforms include: the social project «Coaching for Ukraine» created by the AcademyOcean team, which operates with the support of the state; training courses for teachers on the Prometheus+ platform; professional development courses on the Iteacher platform; the Ukrainian educational online portal for teachers «Na urok»; the educational project «Vseosvita»; and the online education studio Educational Era (EdEra). The experience of the Institute of Postgraduate Education of Borys Grinchenko Kyiv University, where instructors have developed and implemented original training courses for teachers with different levels of digital competence, is highlighted. It is emphasized that the professional development of teachers with the active use of open educational platforms takes place in accordance with the principles of open education. It has been found that the content of the in-service training of teachers of science and mathematics education and technology in the context of the use of digital tools in the educational process contributes to the renewal of the organization of the educational environment of a general secondary education institution in a remote mode, highlights the features of the learning process organization of students in synchronous and asynchronous modes. It has been proven that the use of digital tools by a teacher is closely related to his digital competence, which needs attention from the professional development system.