My personal favorite to keep an eye on is https://www.gpui.rs/.
It's what Zed(.dev) is based on. While not quite ready for prime time from what I understand, if Zed is the reference implementation, I'm sold!
This was recently on HN and I think it adds so much value to GPUI: https://github.com/longbridge/gpui-component/
I installed Zed to read JSON logs that caused my browser and Pycharm (Jetbrains, Java-based) to lag hard. Sometimes I scroll down to the millionth line since the quickness makes me think I downloaded only a subset.