FileInvite - Stop chasing your clients for documents! Easily request files, documents, forms & signatures from your clients – set a due date and save hours as your requests are returned to you effortlessly.
Walkaround - Walkaround is a variant of Wave, based on the Apache Wave code base, that runs on App Engine.
iDeals Virtual Data Room - iDeals Virtual Data Room is a tool that provides secure access to large amount of confidential documents and can view, analyze and collaborate in a protected environment.
Slack - A messaging app for teams who see through the Earth!
Clinked - White-label Client and Team Workspace
Rizzoma - Email and IM are linear contextless communication tools.