Are.na is described as 'Save content, create collections, and connect ideas with other people' and is an app in the Education & Reference category. There are three alternatives to Are.na for a variety of platforms, including iPad, iPhone, Kindle Fire, Android and Online / Web-based. The best alternative is Pinterest, which is free. Other great apps like Are.na are weheartit.com (Freemium) and Pinry (Free, Open Source).
We Heart It lets you create an online album (a heart) with your favorite images and videos. At the same time you can see what other people are adding to their own hearts and save it on yours to grow your collection.