For lower levels Pickup Thai podcast has some decent upper-beginners material, though it's paid. To learn to read I did a brief course of reading/pronunciation lessons based on the Benjawan Becker (paiboon) books that most people use because they're one of the few beginners materials. I don't like the paiboon books that much but their dictionary app is excellent.
Read Thai in 10 days is widely recommended too. The site Thai-notes.com has some good resources for beginners - lower intermediate.
Also the site selfstudythai.com has some interesting intermediate study materials featuring news articles with transcripts broken down into sentences for study. There's a corresponding anki deck you can find on ankiweb if you want to study the vocabulary in flashcards. It's a good resource for building vocabulary related to current affairs.