Inspired by this phenomenal write-up of the author's experience in rewriting tmux[1], I'd like to hear from HN: what codebases would benefit from a similar treatment? Or what codbases would you like to see get the 'star' treatment in some way or another -- an upgraded tech stack, modernization, or a rewrite in another language, or in a different idiom/pattern, that you think would be better suited to the job it does?

[1] https://news.ycombinator.com/item?id=44455787