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mdpi is a publisher of peer-reviewed, open access journals since its establishment in 1996.

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sci-hub website. get free access to academic journals. download research papers for free from sciencedirect, ieee, wiley, springer, nature and others

semantic scholar uses groundbreaking ai and engineering to understand the semantics of scientific literature to help scholars discover relevant research.

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brainly is the knowledge-sharing community where hundreds of millions of students and experts put their heads together to crack their toughest homework questions.

scientific research publishing is an academic publisher with more than 200 open access journal in the areas of science, technology and medicine. it also publishes academic books and conference proceedings.

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academia.edu is a place to share and follow research.