1. Kahoot is an application providing you prepare quizes and surveys. You can easily resgister yourself as a teacher. It's totally free at every stage. Your students try to answer the questions as quickly as possible within a group of other students. By this time,there is a certain limited count down determined by you. And  the rest of it is watching  funny , competitive and challenging classroom enviroment and little got crazy students:)

2. Padlet, the smartest appication I have ever used as a teacher. There is an interactive bulletin board which provides you to add photos,docs,audio records, videos. Students can cooperate your bulletin board or create his/her own. It's easy to share at all social networks.If you are working on local or international projects. That is the best!