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

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.

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.

AttachDoc - Transform the way you work with documents

Locklizard Safeguard PDF Security - Locklizard Safeguard PDF Security provides total PDF DRM protection and control over your documents...

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