Flippity provides the ability to create sets of ' flashcards ' around a Google spreadsheet. Flippity can be used in exercises that develop students' conceptual understanding, and is particularly suitable for use within the monological and the dialogical form of teaching. 
In the monologic form of teaching български Flippity can be used to train and test students in their understanding of different concepts. The teacher can, after creating a Google Spreadsheet with pair of terms, share it and import it to Flippity. It is possible to add photos and Youtube videos on a flash card, simply by putting the link to those in the cell in the Spreadsheet, that is corresponding to one side of the flashcard. At first, you must copy a template into your Google Drive. It only has to be done the first time you create flashcards, and only requires that you click here. After filling in the spreadsheet you have to share it, and then copy the link to it in the box at the bottom of this page. This will open a page with the set of flash cards, and you can share this page with your students – either by sharing the URL or by generating a QR-code.
Within the dialogical form of teaching you can let students develop their own flashcards, where they define various words and concepts within a topic. Students can then share their flashcards with other students, which allows for Flippity to be used as small training games.
It's free to use Flippity, but it requires that you have a Google Account, in order to create your flashcards in a Google Spreadsheet. If you need help getting started, you can read this Guide to Flippity.