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sci-hub-now
Free access to academic papers with just a single click! Abolish publishers, long live the open access movement! 🦅
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Many!
In biology and medicine, pubmed is the most common ( https://pubmed.ncbi.nlm.nih.gov/ ) .
For general purpose you can use google scholar ( https://scholar.google.com/ ).
When you find an interesting article, both these tools will allow you to both seach backwards for articles that it cites, and search forwards for articles that cite it in turn.
Finally, both of these tools yield you a DOI which you can plug into scihub. You can also install the extension "Sci-Hub X Now!" to do this last bit for you. ( https://github.com/gchenfc/sci-hub-now )