: A professional network for scientists and researchers where you can find and request full-text versions of papers and see what peers in your field are reading. Papers We Love - GitHub

: The gold standard for open-access preprints in physics, mathematics, and computer science. You can use tools like alphaXiv to see discussion layers on top of these papers.

: An excellent long-running blog by Adrian Colyer that provides concise, high-quality summaries of a new research paper every day.

: A discovery layer for arXiv that allows users to "upvote" papers, making it easier to find the most "interesting" or trending research in a specific field.

: A massive community-led repository on GitHub that archives influential computer science papers, often categorized by topic like Distributed Systems or Artificial Intelligence.

If you are looking for high-quality, "interesting" papers in general, there are several highly-regarded repositories and curators where such content is frequently shared: Top Sources for Interesting Papers