http://www.gooru.org/#collection-play&id=d5abdb10-9b7b-4e55-89b8-b9e8b2111915
http://www.gooru.org/#home
https://app.easycbm.com/
http://www.how-to-type.com/touch-typing-lessons/how-to-type-home-keys/
http://www.ducksters.com/history/world_war_i/
http://www.mathchimp.com/