Lino is a tool for both PC and Android/iPad. A cork board that allows collaboration to take place by users pinning stuff to the cork board.
Seesaw is an app that allows you to get input immediately. Need an opinion on something? Share it with your friends and they can cast a vote to provide feedback.
Trello is a website as well as available on many tablets. Organize anything and everything together. Collaborate together in real time to get things done.