Unison alternatives

Lead your team from your smartphone. Get to the right people and information instantly. See what's happening across your business — now. Make a Unison room for each of your teams or projects. It's a private space to post updates, questions, files, ideas, and get fast feedback. You will always know what is happening and can direct activities much more effectively.
Unison alternatives are:
Bitrix24, Salesforce Chatter, Yammer, Socialcast
Here are the latest news about Unison:

2014 Unison - virtual rooms for collaboration and discussions

The new service Unison - is an interesting combination of intranet chat, internal social network and video-conferencing. It allows to create virtual rooms in which you can invite colleagues and communicate with them in format of activity stream, as well as via voice and video chat. In the sidebar you see co-workers that are currently in this room or online (in other rooms). It's possible to speak to co-worker personally via Gmail-like chat. Unison provides a mobile version so it's possible to communicate and collaborate from your phone.  The service has a free version for 5 users, which includes also audio and video calls. Paid version starts from $8/month per user. You can also buy the system in a box to install on your own server.