AttachDoc - Document sharing and tracking platform designed for businesses and professionals.

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.

HelpRange - HelpRange lets you easily share documents and analyze their usage.

Attach - Gain the insight and control you need to close more deals. Attach helps you understand how your customers interact with your content so you know how to time and tailor your follow up for maximum impact.

pitchXO - Be more successful by knowing who views your slides, when they view them - and which ones they were...

DocDroid - DocDroid is a service for sharing document and slides.