Scientific toolbox

• Recommend STEEL GRIPS for coverage in ISI Web of Science

SI international system of units :

• General information on the International System of Units (SI) - National institute of Standards and Technology, USA.
• A comprehensive list of units and derived units can be found here: General unit, currency, and temperature conversion - Freie Universität Berlin, Germany (in English)
• One of the best unit-converters I found. Quick, elegant interface. - Jan Derk Stegeman, Netherlands
• Conversion of basic physical quantities - Process Associates of America

• The periodic table on the World-Wide Web WebElements Periodic Table
• MLine pro Werkstoffdatenbank. Recherche nach Werkstoffen und Anwendungen. (in German)

• Glossary of steel and related materials (beta testversion)

• Stahl Lexikon online (in German) (Testbetrieb)
  Eine Material-, Produkt- und Anarbeitungskunde für den Stahlhandel, die Stahlproduktion und die Stahlherstellung
  
• Check your IP-Address
  
• Stahl-Zentrum Information Technik und Bibliothek
  
• LEO Wörterbuch - Dictionary German-English / English-German