A filesystem with the best ideas in Linux storage got merged into mainline, thrown out of mainline, and told to ship itself out-of-tree. The technical story and the politics story are both worth your attention.
Ladybird is building a browser engine from scratch with no corporate parent, no monetization, and a 501(c)(3) behind it. It also just moved half its engine to Rust with LLM help and lost about a year doing it. Both of those things matter.