MottGMoonlight is a nice AI tool for being able to view a research paper and do interactive Q&A with it. It gives very good explanations of keywords, figures, and formulas used in papers. It is not a search engine, so you need to manually upload papers that you want to use with it. The vertical scroll bars for it do not render properly in Firefox but it works properly in Chrome.
https://www.themoonlight.io/paper/049be9b4-0984-4e5b-b6c2-f1c66879b2c5
