https://wentin.github.io/elementary-icons/

是这个吗？ Inkscape

It is recommended to use the free and open source Inkscape vector editor to create elementary icons. Any and all icons must follow the elementary Icon Design Guidelines.

Figma 也可以的打开「 show pixel grid 」以及 「 snap to pixel grid 」」可以对齐到像素又绘制矢量图形。