Water is an anomalous liquid because its properties are different from those of the majority of liquids. However, the category of anomalous liquids could be greater than what so far supposed. Here, we review what is anomalous about water, which are the other liquids that are as well anomalous, and which are those that could be anomalous. We ask questions such as: Why is water anomalous? Are other liquids anomalous for the same reason as water? How can we define models that capture the complexity of water and other anomalous liquids, but are tractable for theory and simulations? Can we make predictions with these models that can be tested in experiments? We discuss here possible answers to these questions.