I was wondering, are there any lessons like this http://pacujo.net/esperanto/course/ that teaches a different language like German?

I've seen Internet courses for languages like German, but I haven't seen free Internet courses. Unless, of course, you count the kind of native-speaker-tutelage you get at language enthusiast websites like Unilang and ZBB.

Is that what you were asking?

I think so. The link I give is an email course. When you sign up you get a tutor that you email your answers to the exercises to. You also get a personal bookmark that gives you the lessons and to me the lessons run well.

Is that what you mean by native-speaker tutelage?

Hello, try this:

http://www.neoslavonic.org

Welcome to our on-line English tutorial of the Neoslavonic language (NS), which is a non-commercial project made for the interslavic community. Neoslavonic is a zonal constructed language made to facilitate direct communication between speakers of Slavic languages group. This group covers Russian, Ukrainian, Rusyn, Belorussian, Polish, Sorbian (Lusatian), Czech, Slovak, Slovenian, Croatian, Bosnian, Montenegrin, Serbian, (Slavo)Macedonian, Bulgarian and various dialects. Over half of Europe's territory is inhabited by Slavic-speaking communities. The worldwide population of people having Slavic descent is close to 400 million.

Neoslavonic language design is based on the harmony of following three principles:

• To share grammar and common vocabulary with modern spoken Slavic languages in order to build a universal language that Slavic people can understand without any prior learning.
  
  
• To be an easy-learned language for those who want to use this language actively. Non-Slavic people can use this language as the door to the big Slavic world. We believe, that knowledge of NS enables both Slavic and non-Slavic people greater passive (e.g. receptive) understanding and better learning of the living Slavic languages.
  
  
• Neoslavonic continues the tradition of the Old Church Slavonic language (OCS). OCS was the first literary Slavic language, believed to have been artificially developed in the 9th century by two Byzantine Greek missionaries Saints Kyrillos and Methodios, who were credited with standardizing the Slavic dialects and were using it for translating the Bible and other ecclesiastical texts as the tool of the Christianisation of the Slavic people. OCS is still frequently used by the Orthodox Church and sometimes also by the Roman-Catholics in many Slavic countries up to the present days. NS is designed as the modernized and simplified but still sufficiently compatible version of this language.

I cannot dissagree more.
There are plenty or even pletphora of languages courses online for free (and legal).
from my favourites:

http://pilipino.nobody.jp/pilipino/
http://el.osaka-gaidai.ac.jp/flc/
http://www.coelang.tufs.ac.jp/modules/
http://www.seasite.niu.edu/