Automotive

• Serious Wheels - EN (loads of high resolution images of serious cars)
•  Drive Magazine - GR (greek automotive magazine where you can check news, races, prices, etc)
  
•  4 troxoi - GR (greek automotive magazine where you can check news, races, prices, etc)

 Science

• Wolfram Research - EN (the site of the company that has developed the Mathematica package. It is a great science encyclopedia)
• How stuff works - EN (the site contains basic information regarding the operation of numerous machines that surround our everyday life)
• TEE - GR (the site of the Greek Institute of Engineering)
• American Mathematical Society - EN (Among others includes online free pdf books you can download)
  

Computing

• SourceForge.net - EN (this is the No. 1 place to check on open source software) 

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