Waver - Description: Google Wave is a great way to communicate and collaborate. Waver lets you:
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Rizzoma - Email and IM are linear contextless communication tools.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
BSI Knowledge Manager - Central document management & knowledge base
LiveChat - LiveChat - premium live chat software. Approach customers directly on the website, make connections and drive more sales using LiveChat.