The database preset will allows you to add Pictures, videos and text on the front and back of the flashcard. You can also customize the look and feel of the preset through the CSS template of the preset.
Chris has also recorded a demonstration video of the preset which you can watch at this link or embedded below:
You can download the preset from this link and use it any of your Moodle course to create flashcards for your students without any plugin or external service. The preset is released under Creative Commons license and will works on all Moodle versions from 2.2 onwards.
What are the other ways to create flashcards in Moodle course? Do let us know in the comments below.