Waver - Description: Google Wave is a great way to communicate and collaborate. Waver lets you:
ShareVault - ShareVault provides Virtual Data Rooms for secure document sharing during due diligence and other business critical processes.
Rizzoma - Email and IM are linear contextless communication tools.
Drooms - Virtual data room software
BSI Knowledge Manager - Central document management & knowledge base
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.