Yes, both Filestage and Google Drive offer a Free Trial.
Filestage is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Google Drive is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Filestage Starts at $19/User/Month when Billed Yearly whereas for Google Drive Starts at $8/User/Month.
Some top alternatives to Filestage includes PageProof, GoProof, Ziflow, ProofCafe, QuickReviewer, Workgroups DaVinci Proof, WebProof, Coment, MediaMarkup and Proofing.
Some top alternatives to Google Drive includes CollaborateCloud, Odrive, CloudFiles, Dropbox Business, Zoho WorkDrive, FileCloud, Microsoft OneDrive for Business, Dropbox Professional, DocUp and OpenDrive.