Learn a language efficiently with cards using the Leitner method.
Keep It Simple and Stupid (KISS) - and without costs.
Collaboration: Share and edit the vocabulary with other learners.
Synchronize your learning progress between your devices.
Translations. At the moment English and German.
HTML5 version is in work. Preview at: http://jfellow.net/lk/
(The HTML5 version will not use GoogleDocs for sharing. Instead it uses a PHP server script that can be put on any PHP enabled server.)