Monolingual Dictionaries

(the entries contain explanations, grammatical information, example sentences, prepositional phrases, frequency of use, etc.)

https://www.collinsdictionary.com/dictionary/english - British; provides both British and American use 

http://dictionary.cambridge.org/ - British; provides both British and American use       

http://www.merriam-webster.com/ - American      

https://www.lexico.com/ - Oxford English dictionary online; provides both British and American use       

https://www.macmillandictionary.com/ - British     

https://ludwig.guru/ - words in context with a list of sources

 

Bilingual Dictionaries                                                                                                                

https://slovniky.lingea.cz/anglicko-cesky - here you can buy a desktop version of a dictionary containing a list of technical collocations

https://www.linguee.com/ - words in context

https://cs.glosbe.com/ - words in context

https://cs.bab.la/ - words in context

http://matika.umat.feec.vutbr.cz/inovace/preklad/matematicky_slovnik.pdf - mathematical dictionary

 

Grammar and Writing                                                                                                              

https://www.autoenglish.org/freeexercises.htm - explanations and practise of grammar

http://www.edufind.com/english/grammar/toc.cfm - grammar guide-post

https://www.grammarly.com/ - a writing assistant (also downloadable)

www.uefap.com - academic writing

 

Listening, Pronunciation and Conversation                                                                           

http://www.esl-lab.com/ - listening comprehension exercises

TTS 1: https://ttsdemo.com/ - text-to-speech tool

TTS 2: https://ttsmp3.com/ - downloadable text-to-speech tool

http://esl.about.com/od/speakingenglish/Speaking_English_Pronunciation_and_Conversation_Skills.htm - conversation and listening

https://www.evaeaston.com/ - listening and pronunciation

https://www.opensubtitles.org/ - subtitles to download

www.italki.com - place to find a tutor or a partner for a one-to-one conversation

 

Reading                                                                                                                                      

www.gutenberg.org - books to download legally for free

https://www.howstuffworks.com/ - how everything works

https://breakingnewsenglish.com/ - current news in simple English + practice


Miscellaneous                                                                                                                           

http://www.bbc.co.uk/worldservice/learningenglish/ - study English

https://www.helpforenglish.cz/ - English explained in Czech

http://www.technologystudent.com/ - technical website run by a native speaker

https://www.lextutor.ca/tests/vst/ - test how extensive your English vocab is

https://www.edx.org/ - massive online open courses prepared by world-famous universities