The document discusses various business communication apps that can help companies improve efficiency and productivity. It describes apps such as Slack, HipChat, Basecamp, and DialMyCalls that allow internal teams to collaborate through chat rooms, private groups, direct messaging, and mass notifications. Other apps mentioned include Redbooth, Wrike, Skype, Flowdock, and Azendoo, which provide features like task tracking, project management, video/voice chat, and messaging capabilities to facilitate communication between employees.