"Hangouts brings conversations to life with photos, emoji, and even group video calls for free. Connect with friends across computers, Android and Apple devices."
Great for group projects and keeping in touch with family and friends.
"join.me combines instant screen sharing and powerful meeting tools in an app that anyone can use to present, train, demo or concept. join.me is designed to be intuitive and accessible, providing features that you'll use every day for everything from show-and-tell to formal presentations."
SpiderScribe is an online mind mapping, brainstorming, and collaboration tool. Organize your ideas by connecting notes, files, calendar events, images and more in free-form maps.