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