Yin-Yang VS terminator

This is light-weight alternative to Koi and Ying-Yang. The main difference is in its simplicity and customization of a bash script. It includes a home directory variable file when installed, which can add functionality but also just holds values such as the sunrise delay. Installation is simple and no downloads are needed other than the script.

For now Itchy and Moe Themes are my two favorites. I use Yinyang to change from light theme to dark theme. You can downloaded it here

Yin-Yang

I know about Koi, Yin-Yang, AutomaThemely, Plasma Theme Switcher and the widget I was talking about in last comment, Dynamic global themes. Once I even made a very poorly written and simple script to toggle KDE global themes, gtk themes, konsole colorscheme etc all at once and it barely works but I want to see an officially supported toggle to allow Auto Day/Night theme change in System Settings.

YinYang: https://github.com/oskarsh/Yin-Yang

Until recently, my answer would have been Terminator. Recently, however, the lack of support for OSC52 and the fact that the workarounds don't always work reliably has been bothering me more and more. Based on https://gitlab.gnome.org/GNOME/vte/-/issues/2495, it is quite unlikely that VTE (and therefore Terminator) will ever support OSC52.

For terminal software, I really enjoy using Terminator, because it allows me to spawn several tiled terminals in a single window, with a custom arrangement that can expand and shrink easily.

I use Terminator as terminal emulator and ZSH as shell.

Using a Terminal Emulator with native support for split panes (Examples: Terminator)

I use the ZSH as a shell with its own configuration. As terminal emulator I use Terminator. From my personal point of view I don't need anything more modern.