Art of Problem Solving is a community where students discuss physics olympiad problems and share solution approaches.
A public question-and-answer archive where users solve physics problems and explain concepts.
Physics Forums is a community discussion site where users can ask questions and get guidance on physics, mathematics, and engineering topics.
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.
Download hub for free past exam PDFs organized by subject with accompanying student forum.
Online coaching platform for IIT JEE and medical entrance exams with faculty support and adaptive learning.
Online tutoring platform covering HC Verma physics problems.
Tool for annotating and discussing academic papers in journal clubs.
Russian peer-to-peer question-and-answer platform where users ask homework questions and receive explanations.
Major Russian online forum for scientific discussions and peer-to-peer learning in mathematics and physics.
Russian platform where teachers assign tasks and the system guides students through errors.
Community-built bank of Indonesian national science competition physics problems.
Crowdsourced physics question bank with community explanations, accessible by search.
These are filed under other headings but serve this one too.