Caltech
Yes, both Google Docs and Overleaf offer a Free Trial.
Google Docs is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
Overleaf is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Google Docs Starts at $6/User/Month whereas for Overleaf Starts at $15/Month.
Some top alternatives to Google Docs includes Nimbus Note, Microsoft OneNote, Google Sheets, Documint, Dropbox Paper, Microsoft Word, pdfFiller, LibreOffice, iWork, WPS Office and WordPerfect Office.
Some top alternatives to Overleaf includes Manuscripts, Etherpad, PleaseReview, Documint, Microsoft Word, Google Docs, pdfFiller, ReactiveDoc, LiveDocs, Slick and SciSpace (formerly Typeset).