Download
You may download this app using F-Droid:
Source code
The source code is on GitHub.
Info
Information about this app is available here.
Screenshots
Try it!
If you wish to try the app without creating your own flashcards first, you may download sample filing boxes.
Igel100: Igel (German for hedgehog) in different languages. Download here for flashcards without formatting and here for flashcards with formatting.
More on GitHub.
Changelog
A complete version history is available here.