Here are some Plymouth Themes, which are inspired by the macOS Boot animation, based on this theme:

https://www.pling.com/p/1805336

The idea for the Desktop/WM Plymouth themes came from another user who commented on one of my other themes. If you want to say “thank you”, please thank the other user.
→ If you have the feeling, that i missed a Desktop or WM Theme, please let me know.

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These Plymouth Themes are available:

→ Budgie
→ Cinnamon
→ Cosmic
→ Gnome (Blue, White), (Gray, White)
→ Hyprland
→ KDE
→ LXQT
→ MATE
→ Plasma
→ UKUI
→ Unity
→ XFCE


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Installation:

1.) The packages "plymouth-themes" and the Cantarell fonts should be installed (system wide) - (for two-step.so and the themes uses the Cantarell fonts (for offline-update e.g.)
2.) Download the theme, which you like
3.) Extract the archive
4.) Copy the extracted archive-folder to /usr/share/plymouth/themes/ (sudo/root permission required)
5.) Depending on the distribution, the theme need to be applied


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Installation Examples:


Ubuntu/Linux Mint:

### *my-plymouth-theme* should be replaced with the theme-name which you downloaded (without the **)

sudo update-alternatives --install /usr/share/plymouth/themes/default.plymouth default.plymouth /usr/share/plymouth/themes/*my-plymouth-theme*/*my-plymouth-theme*.plymouth 110

### With this command, you need to select the theme

sudo update-alternatives --config default.plymouth

### Apply the selected theme:

sudo update-initramfs -u -k all

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Arch Linux/Debian

### You need to look, if the system recognizes the theme (if the theme is located in /usr/share/plymouth/themes/)

sudo plymouth-set-default-theme -l

### If the theme is in the list, you can apply this with the following command (Also here, *my-plymouth-theme* should be replaced):

sudo plymouth-set-default-theme -R *my-plymouth-theme*

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Fedora:

### You need to look, if the system recognizes the theme (if the theme is located in /usr/share/plymouth/themes/)

sudo plymouth-set-default-theme -l

### If the theme is in the list, you can apply this with the following command (Also here, *my-plymouth-theme* should be replaced):

sudo plymouth-set-default-theme -R *my-plymouth-theme*

### Don’t forget, to re-build the initrd, if not already done:

sudo dracut --regenerate-all -f


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Additional Information:

Once the theme has been installed and applied, I hope you enjoy using it.
You may need to add some boot parameters, to make the boot animation more "fluently"

Some examples: "quiet splash loglevel=3 rd.udev.log_level=3"