I made a little language learning tool. It represents languages as a trie data structure, so that learners can quickly pick up phrases and usage patterns when they learn a new word. It's a bit rudimentary at the moment, but I intend to make a flurry of changes soon (AI integration for example sentences, prettier UI, AnkiConnect for the flashcards, and maybe more puns?). The trie was built based on movie and TV subtitles, so hopefully a decent representation of real-world speech.

It's currently available in French (French Tries), Spanish (espárbol), Portuguese (PorTRIEguese), Italian (Trietalian), German (Triedesco).

You can check it out at trielingual.com