Readlang is an extension for your browser or an app for your mobile device, and it translates any website. With Readlang you can just tap on any word and it will translate it for you - and then you can save it for later or add to your flashcard system.
It makes language learning so much more interesting because you can look at anything that's relevant to YOUR life. We recommend this one for learners who are intermediate to advanced and want to maintain their language levels.
If you're a Welsh learner, there's a similar system built into the BBC Cymru website ("Vocab" button in the top right).
5) Google Sheets Translate
This is the best for anyone wanting to build word lists in several languages. Google Translate has now been added to Google Sheets, so what you can do is build a simple vocab list in a spreadsheet, then set all those words to auto-translate into another language.
Here's the detailed Google article explaining how to use this function.
If you have a csv file, you can even export from your favourite flashcard app and add it back in to google. It's perfect for polyglot learners who are working on several languages.
Honorary Mentions
Welsh-specific:
Everlasting Classics
italki, Memrise (Anki/Quizlet), HelloTalk
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