Capture - A great free screen capture utility that allows you to capture either a window or the desktop and save it to either a file or the clipboard.

Dead Simple Screen Sharing - Simple screen sharing and audio conferencing software.

Bigbee - Connect with anyone, anywhere.

Demodesk - Collaborative screen sharing for sales & success teams

Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Witeboard - A real-time whiteboard for your team. No signups required.