Breeze Icon Theme has been developed by The KDE Visual Design Group.

Main work for the icon theme: Uri Herrera, Ken Vermette, Andrew Lake, Alexey Varfolomeev, Alessandro Longo, varlesh and Andreas Kainz

For color changes to match the Adwaita KDE theme:
Josh Freeno 
freefreeno
https://github.com/freefreeno/Adwaita-KDE
