AirSend - Connect with People to get work done. Have conversations, share files, complete tasks, and get work done in one space.
Sametab - Share company announcements in your coworker's new tab
Twake - Be more productive with Twake : the collaborative work platform to organize and manage all your projects on a single platform.
Slack - A messaging app for teams who see through the Earth!
Dropbox - Online Sync and File Sharing
Shoutboards - Internal announcement platform for better knowledge sharing.