I just yesterday came across Hypatia, a GNOME app made by @nathandyer. It fantastic for looking up information about some word that you just came across. I've so far used Quick Lookup for that but it just brings Wiktionary definition, Hypatia looks up DuckDuckGo results, Wiktionary results and Wikipedia results! It hangs a bit on search on my slower machine but maybe with some optimizations and loading indicators it could be the best app for everyday use!
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