Vocabo helps you learn and remember new words in a foreign language.
Simple and great. It would be nice if there is a feature that randomly select a few word on the webpage and translate it to the language that I want to learn, like the plugin toucan which doesn't support Russian
https://vocabium.appspot.com/
because_curious
https://vocabbi.com
https://vocabu.online/
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votabextension
vfsoftwaredev
Zocab
aprendeconloro