Resources
Dictionaries & Thesauruses
A thesaurus showing synonyms is still my favorite tool in particular when writing to avoid repetition.
http://www.oxforddictionaries.com/words/english (advantage: synonyms are shown in context)
http://www.merriam-webster.com/
If you are new to using an English-English dictionary, wikiHow can help.
www.wikihow.com/Use-a-Dictionary
Collocations
Collocations are word combinations (e.g. noun & verb or noun & adjective etc.) that native speakers regularly use. Knowing collocations can give you the ‘native-speaker’ edge.
http://flax.nzdl.org/greenstone3/flax?a=fp&sa=collAbout&c=collocations&if=flax
Euphemisms for Business
A euphemism is an expression that 'sugarcoats' an issue (euphemism for 'problem'). In business this is often used to soften bad news e.g. instead of 'unemployed' the expression 'between jobs' is used.
http://www.businessenglishresources.com/euphemisms-in-the-workplace/
Grammar
http://www.quickanddirtytips.com/grammar-girl
Despite the quirky name, she has developed in a respected source for grammar questions.
https://owl.english.purdue.edu/owl/
OWL for Online Writing Lab of the Purdue University with excellent grammar exercises.
Practical English Usage
by Michael Swann. It is an expensive book (not as e-book) but very useful for specific grammar questions.
Understanding and Using English Grammar, 5th Edition
by Betty S Azar, Stacy A. Hagen. Like the Swann, it is expensive and not available in electronic form, but in my view, it is the best source available with clear explanations of grammar concepts and abundant exercises.
Online Editor
https://www.grammarly.com/
This website offers editing of texts for free and is more effective than for example the error detection in Word. If you need to write a substantial amount and flawlessly like me, you can upgrade to a paid version. For everybody else the free version is absolutely sufficient.
Business
http://www.investopedia.com/dictionary/ Explains business concepts.
http://www.businessdictionary.com/
Culture
http://www.executiveplanet.com/
This is my personal favorite as it is mostly written by people from the country and divided in easily accessible topics like dress code, usage of names, decision making etc.
http://www.worldbusinessculture.com/
Very comprehensive information going far beyond business (e.g. history).
http://www.commisceo-global.com/country-guides
More general information less focused on business.
General
http://www.bbc.com/future/story/20160811-the-amazing-benefits-of-being-bilingual
A BBC article about the benefits for health and otherwise of being bilingual.
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