Art of Problem Solving is a community where students discuss physics olympiad problems and share solution approaches.
ResearchGate; a social network for researchers to share preprints and papers.
Quizlet hosts flashcard sets for physics topics including Blundell, Griffiths and Young-Freedman textbooks.
Online tutoring platform covering HC Verma physics problems.
Russian peer-to-peer question-and-answer platform where users ask homework questions and receive explanations.
Russian platform where teachers assign tasks and the system guides students through errors.