Vocabla
Description: Vocabla is a free online vocabulary and flashcard app to help improve your vocabulary. It allows you to create custom word lists and flashcards to study, with options for multiple choice, written, and listening questions. Vocabla tracks your progress so you can focus studying on words you struggle with.
Type: software
Wiktionary
Description: Wiktionary is a free, collaborative, multilingual dictionary project operated by the Wikimedia Foundation. It aims to describe all words of all languages using definitions, etymologies, pronunciations, synonyms, and more.
Type: software