Digital Dialects
Digital Dialects: Verb Conjugation in German Language
Learn to conjugate verbs in German. Play a game to practice and master the words.
Other
German for Travelers: The Internet Handbook of German Grammar
The goal of this site is to provide a "concise and comprehensive [online] reference grammar."
Quia
Quia: Match Past Tense Sentences in German and English
Practice German language skills with sentences that use common verbs in the past tense.