Rizzoma - Email and IM are linear contextless communication tools.
Smartwaiver - Smartwaiver is an online waiver solution for business to manage signed waivers and customer data.
Slack - A messaging app for teams who see through the Earth!
WaiverForever - Electronic waiver system for small businesses
Walkaround - Walkaround is a variant of Wave, based on the Apache Wave code base, that runs on App Engine.
WaiverSign - Cloud-based waiver and release of liability signing software