This article talks about a blockchain-based document manager where you can safe-keep your documents and share them privately with others.

iSecureDocument is a handy online service to send documents securely to people. It establishes a secure and encrypted channel between server and sender.

PandaDoc is a free online document sharing service which you can use in order to easily share documents online with your colleagues, clients and more. Free.

GroupDocs is a free online document sharing service to view, edit, share, and sign documents anywhere, virtually. Try GroupDocs free.

DocStoc is an online document store to share and sell documents, sync documents on PC and Mac, and send large documents in email.