[HaroldPD]

Epsilon editor from https://www.lugaru.com/

Stable and fast with EMACS-style behaviour and key assignments.

Has C-like extension language named EEL that you could convert / re-write the vundo tree in.

[petepete]

I love that Epsilon is still live and kicking. I've only ever met one person who used it but he was truly at one with the editor and traversed a large complex codebase with ease.

[kragen]

I used to use ϵpsilon, but then 32 years ago I got access to GNU Emacs, and I didn't look back. Maybe it's gotten better since then.

[achempion]

Does it support syntax highlighting for modern languages? What about having multiple languages in one file (.tsx or .heex, for example)?