See also:
https://inciteful.xyz/
https://elicit.org/
https://app.dimensions.ai/
https://www.researcher-app.com/
https://www.wosonhj.com/
Few more here: https://github.com/helenahartmann/awesome-PhD
Not papers, but other tools for academics possibly worth knowing about:
https://openaccessbutton.org/
https://infranodus.com/
https://web.hypothes.is/
https://grantway.induct.net/
https://conferencealerts.com/
https://github.com/sindresorhus/awesome
https://www.angryreviewer.com/
I hoard tools. Organizing my lists atm to share. 🤷♀️