Monolingual dictionaries

• http://www.macmillandictionary.com
• http://dictionary.cambridge.org
• http://oxforddictionaries.com/
• https://www.merriamwebster.com/
• http://www.businessdictionary.com

Bilingual dictionaries

• http://dict.leo.org/
• http://dict.tu-chemnitz.de
• http://www.linguadict.de

Grammar

• http://www.ego4u.com/en/cram-up/grammar

Vocabulary

Business Vocabulary in Use by Cambridge University Press (various titles and editions)

Professional English in Use by Cambridge University Press (various titles and editions)

• https://www.phase-6.de/ (tool for learning vocabulary)
• Http://www.wordle.net  (tool for visualizing vocabulary)

Writing Skills

• University Writing Centre (workshops and platform offered by the Language Centre)

Language Learning Portals

• http://www.bbc.co.uk/learningenglish/
• http://learnenglish.britishcouncil.org/en/

Magazines / Newspapers (both online and print versions)

• Spotlight, Business Spotlight
• The Economist, The Financial Times, The Guardian, The New York Times etc.

Audio and video

• http://www.ted.com
• http://www.youtube.com/
• http://www.eslpod.com
• http://www.engvid.com

Other material

• http://www.howstuffworks.com/
• http://www.ehow.com/
• http://cnx.org/content/col11227/1.4/
• http://cnx.org/content/col11325/1.43

Platforms

• PBWorks Wiki (https://businessenglishone.pbworks.com)
• LEA (https://lea.hochschule-bonn-rhein-sieg.de/)
• Turnitin (https://www.turnitin.com)