Same, I could never really get into mastodon as I never liked Twitter much, so I'm pretty happy I found out about Lemmy. I know everyone on this site has been saying this, but it feels fresh, and the fact that it's all open source and community owned is great.
Nethack! It's basically the original roguelike, if you liked shattered pixel dungeons then you'll like nethack. There are also several other open source rogelikes to check out as well... including the original Rogue!