I absolutely love the
LEO English-German-English dictionary and I use it all the time. I saw an appeal from them for donations, triggered by the fact that my ad-blocker had cleaned all junk off the site, so I did indeed as asked and gave them a donation.
My god, if things like this had been around when I was at school forty years ago. Wiktionary too, which is stunning for etymology, for which I use it every day. Wiktionary is now even amazingly good for Scottish Gaelic too (the alternatives being
SMO stordata and the stunning
web-based Dwelly aka ‘God’) and Wiktionary is really getting there for Old Irish too.