Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Nifty - Manage projects, work, and communications in one place.
Whiteboard for Skype Interviews - Skype brings a whiteboard to Skype Interviews
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
YouOgle - Drop-in video chat app
Flow - Stop managing projects from your inbox.