The SDG in Action App: Learn about the 17 SDGs, get news on your favorite goals, find out what you can do to achieve them, create your own events, and invite others to join you in sustainable actions.
Connectable: A list of 55 ways you can take sustainable action.
ElectroCity: A free online computer simulation game that lets players manage their own virtual towns and cities. It's great fun to play and also teaches players all about energy, sustainability, and environmental management.