The best alternatives to Markbook are Heyday, Dokkio Sidebar, and ProofMe. If these 3 options don't work for you, we've listed a few more alternatives below.
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Sidebar adds intelligence to web email, collaboration, and research in Chrome. From any web page or web app, tap the content and knowledge from your files, without juggling tabs. Make every search an automatic multi-search across everywhere your files live.
Duedot is a collaboration platform designed by the team at Quokky to help businesses work together with their clients more effectively for documents and information collection. Duedot bring together file sync, conversations, and collaboration features into one powerful product, allowing businesses to collaborate directly with their clients on dossiers using only one tool