Links

Mathematics reference works

www.mathworld.wolfram.com
Mathworld
reference.kluweronline.com
SpringerLink
www.planetmath.org
PlanetMath

Natural sciences reference works

www.chemgapedia.de/vsengine/de
ChemgaPedia

Online dictionaries

dict.leo.org
German-English/English-German
dict.leo.org/?lp=frde
German-French/French-German
www.pons.de
Translation aids for various languages