Simple yet customizable? My thoughts go to Sublime Text if you want a GUI editor and closed-source is OK, or Micro if you want a TUI editor that is open source:

Simple yet customizable? My thoughts go to Sublime Text if you want a GUI editor and closed-source is OK, or Micro if you want a TUI editor that is open source: https://micro-editor.github.io/ https://micro-editor.github.io/ Like OpenBox, most casual users can be dropped in and know their way around their interfaces, and both options are kinda lightweight compared to other modern options. There is power available for serious customization if you want (you can write plugins for them in Python and Lua, respectively). Personally, both Vim and Emacs do not remind me much of OpenBox. I think i3wm is more a Vim, and I guess XMonad is the most Emacs-like window manager I've tried. (Arguably, EXWM is the only truly Emacs-like window manager...)