Tmux

(N)vim

Alacritty

Copy the color scheme into your ~/.config/alacritty/alacritty.yml file

Xfce

Add the theme files to your ~/.local/share/themes directory

mkdir -p ~/.local/share/themes
cd ~/.local/share/themes
git clone --single-branch https://github.com/rtlewis88/rtl88-Themes.git --branch Solarized-Dark-gtk-theme-colorpack
mv rtl88-Themes/Solarized-* .
rm -rf rtl88-Themes

Set the theme in the Window Manager Settings and in the Appearance Settings