ManualsLib - Just enter the keywords in the search field and find what you are looking for!
ShareVault - ShareVault provides Virtual Data Rooms for secure document sharing during due diligence and other business critical processes.
Manuzoid - Repository that includes user manuals for various products
Drooms - Virtual data room software
ManualAgent - Manuals and guides
Dropbox DocSend - Dropbox DocSend is a secure file and document sharing solution that gives users analytics and control of document in their critical workflows. Key features include sending documents as secure links, eSignature, and customizable virtual data rooms.