Atrium_message is a project mainly written in PHP, it's free.
Message-based drop in replacement for Atrium Activity.
Drop in replacement for Open Atrium's core Atrium Activity module.
The Atrium Activity module powers the "Recent activity" blocks by querying the last 30 days of node and comment activity in the database. The Atrium Message module is a Message-based feature that logs activities as they happen.
Download and install Message and this feature. The "Recent activity" blocks will be silently replaced.
Be aware that this module has no awareness of activities which predate it's installation. That means once you turn it on, all previous activity will vanish.
Comment Created, Node Created, Node Updated, Node Deleted, Node Published, Node Unpublished, User Joined Group, User Left Group
Group created, Group updated, User Requests Group Member, User Denied Group Membership, User Promoted to Group Admin, Feature Enabled, Feature Disabled
There are a few major pieces of functionality still missing before you could consider Atrium Message a complete replacement for Atrium Message.