Rizzoma - Email and IM are linear contextless communication tools.
Waver - Description: Google Wave is a great way to communicate and collaborate. Waver lets you:
Walkaround - Walkaround is a variant of Wave, based on the Apache Wave code base, that runs on App Engine.
Jostle - A new kind of employee intranet that drives engagement & workplace culture. Achieves social participation in work relevant way. Participation rates are over 85%.
BSI Knowledge Manager - Central document management & knowledge base
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.