Lots of podcasts and lesson transcripts for various Korean levels. Somewhat spammy marketing, but solid content which I’ve been using for years.
Pathway to Korean
Free beginner lessons online from Ohio State University.
A new, robust site to learn natural Korean in the context of phrases. The site is run by my friend Jimmy and he posts useful phrases and slang.
Talk To Me In Korean
The ultimate Korean resource. If you aren’t using TTMIK, what are you doing? Just kidding. They have podcasts, free lessons, textbooks, videos, the whole shabang.
How To Study Korean
One of the most comprehensive sites out there, although sentences can sometimes sound a little robotic. Use it as you like but remember to use a mix of resources!
Online Intermediate College Korean
Lessons with dialogs, grammar and audio, for intermediate learners.
Sogang Korean Course
Are you stuck in the early 2000s? Would you like a useful resource with a really… retro design? Sogang Korean is the site for you.
Online Korean lessons with expert teachers as well as a great range of learning resources to help you study more effectively.
More resources on Optilingo
Hands down, the best dictionary for Korean learners is Naver Dictionary. If you download the app, you’ll get awesome content like videos, dialogues, Kpop content, daily phrases and more. You can also use the mobile website if you prefer. It’s pretty robust and is clearly geared at Korean learners.
Naver also has a translator called Papago. You can use the audio feature to listen to a native pronunciation. It’s awesome!