Learn German Online German Online Interactive http://www.german-grammar.de/ http://upload.wikimedia.org/wikibooks/en/2/2d/German.pdf http://lw.lsa.umich.edu/german/hmr/links/online_lessons.html
Apprendre l’ allemand en ligne online gratuitement http://www.allemand-online.de/
Aprender alemán online http://www.curso-de-aleman.de/
Imparare il tedesco online http://www.tedesco-online.de/
Hi, I just read your article on resources for online German language training.
This online German trainer is one of the most comprehensive found in the internet. http://www.deutschakademie.de/online-deutschkurs/
According to the page, it disposes of more than 20.000 exercises for ALL language skill levels. You have the possibility to sort these exercise by content of most common German textbooks, respectively by specific German grammar topics you want to practice.
Furthermore it has a help function, which lets you contact a GFL teacher for exercise specific support. It may take a day or so to get the support via e-mail, but the whole service is for free! 