some icons taken from 
https://github.com/elementary/icons GPLv3 

lists:
network.png
star.png
star_blue.png

some icons taken from 
https://github.com/zayronxio/Zafiro-icons GPLv3

lists:
error.png

https://github.com/yeyushengfan258/Win11-icon-theme GPLv3
lists:

clear.png


qt resources example
list:
icons/print.png
icons/programs.png


http://tango.freedesktop.org/Tango_Desktop_Project
list:
internet.png
home.png
configure.png
system-search.png
fileopen.png
addtab.png
wizard.png

https://commons.wikimedia.org/wiki/GNOME_Desktop_icons GPLv3
lists:
windows-list.png
interface.png
closetab.png
icon32_sdict.png https://commons.wikimedia.org/wiki/File:Accessories-dictionary.svg
folder.png
previous.png
next.png
reload.png
icon32_zoomin.png
icon32_zoomout.png
icon32_zoombase.png
hotkeys.png
filesave.png
playsound_color.png