I'm building https://tolearnkorean.com/ , but it's far from finished currently, only meaningful content is an introduction to Hangul so far.

Making it because I believe there's lots of opportunity for high quality Korean learning content.

Also found it annoying that the majority of content out there does not mention other quality resources since they want to keep you in their own (lacking) ecosystem to sell you on their books, coaching sessions, Anki vocabulary cards or whatever it is.

Want to improve my own Korean by teaching it to others.

Also making a site currently that aims to gamify the learning with flashcards, similar to some(!) questions you might see on Duolingo but with your flashcards as a base. Making learning with flashcards more fun and efficient.

I liked BillyGo's videos as a resource in the beginning. The apps I have on my phone to learn are Naver Dictionary, Anki and Migii. Didn't like any other apps I found.