https://arxiv.org/ - arXiv is a preprint repository for research articles in mathematics, physics, computer science, quantitative biology, quantitative finance, and statistics. It's widely used by researchers to share their latest work and stay updated on developments in their fields.
https://mathworld.wolfram.com/ - An extensive encyclopedia of mathematical concepts, with detailed explanations, examples, formulas, and visualizations. Excellent for exploring new mathematical ideas and deepening your understanding of existing ones.
https://www.aps.org/ - Provides access to physics news, research breakthroughs, educational resources, and a job board. Caters to both professionals and enthusiasts.
https://ui.adsabs.harvard.edu/ - ADS is a digital library for astronomy and physics literature. It provides access to abstracts and full-text articles from major journals and conference proceedings in astrophysics, planetary science, and related fields.
https://stackoverflow.com/ - A massive question-and-answer platform specifically for programmers and developers. Excellent for finding solutions to coding problems and staying up-to-date with industry trends.
https://ieeexplore.ieee.org/Xplore/home.jsp - IEEE Xplore is a digital library providing access to research articles, conference papers, and standards in computer science, electrical engineering, and related disciplines. It's a valuable resource for researchers and professionals in the field of computer science.