Where you might find something:

• [3Dsource.de]: Quite old (but not completely outdated) information about 3D technology and its math.

• [VDI Arbeitskreis Fahrzeugtechnik]: One out of the Berlin groups of the Association of German Engineers).
• [RWTH Aachen]: Self assessment to identify your favorit studies.
• [kfz-tech.de]: For whom is interested in automotive technology (basics).
• [k-wz.de]: Animations and explanations about combustion engines.

• [heise.de]: Computer technology information source.
• [Rheinwerk Verlag]: Galileo Open Books.
• [ShieldsUP]: Check your firewall.
• [grc.com]: More computer exposure tests.
• [BSI]: Federal Cyber Security Authority of Germany.
• [Metasploit]: Penetration testing framework.
• [Virtual machines with IT weaknesses]: Learn something about hacking to master challenges in the IT business.

• [Manager Magazin]: Business information source.