Useful English resources

Vocabulary by topics
OALD
LDOCE
Words to Use
WordReference

Word lists
Oxford lists
The AWL Tool
Heteronyms
Homophones
Irregular verbs
Words with disputed usage

Phrasal verbs
Inlingua
LOI English
EnglishClub
Quizzes at UsingEnglish

Phrases, idioms
The Phrase Finder
The Idioms
Cambridge Dictionary blog
One-Minute English
AmE expressions at VoA

Words in use
FrazeIt
Sentencedict
BrainyQuote
English-Corpora
Netspeak
FluentWords

Visual vocabulary
LanguageGuide (multilingual)
Visual Dictionary
LanguageTools
Image quizzes

Grammar
Grammar Cheat Sheet
Scribens Grammar Checker
Grammar at Cambridge Dictionary

Misc tools
DeepL Write
QuillBot
Vocab grabber
Wordtune
Interactive IPA chart

Send your feedback and useful language resources via Contact/Feedback in the menu.