Atlassian Confluence Demonstration
Confluence is an app in which team members can discuss work, record decisions, comment on documents. It gives every team, project, or department its own space to create the things they need, whether it's meeting notes, product requirements, file lists, or project plans, you can get it done in Confluence.
Confluence integrates well with Jira and HipChat, it also supports Google Apps. Easy to setup, navigate, and use.
Watch this short video on how to get started with using Confluence for team collaboration.
Video Source: youtube.com, Atlssian, original link.