Free
Duolingo
Duolingo for Windows: desktop practice for steady language progress
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A free Science & education program for Windows
Qualitative analysis software for video and audio data
Learn Morse code with these lessons
Easily create music your way
Practice and test yourself in a variety of languages
A free program for Windows, by Discovery Communications.
Teaching aid for kids about the Third Reich
Educational Tool for Gene Analysis
German language course for foreigners
Complete English dictionary of synonyms
Comprehensive Verb Conjugation Tool