New.css developer here, thanks for sharing :)
I’ve been thinking about creating a CSS tool somewhere about halfway between new.css and Pico CSS for very basic page layout tools (containers, callouts, menu bars, etc) that still focuses on being extremely small and performant.
I feel that a tool like that would be helpful for laying out a simple but functional site (sourcehut’s site [1] comes to mind) where you need a few basic layout tools but don’t need all of Bootstrap.
I’d love to see NeatCSS on your list. It’s not officially classless but I try to make it semantic as much as possible. I bookmarked you GitHub repo (which you should link on the page if I didn’t miss it). I’ll give it a try myself to see if it works (and maybe make adjustments).
I think this would be excellent. There's a whole class of websites /landing pages which right now Astro seems to be filling that niche. It's mind boggling how hard it is to do basic components on the web