ScreenRuler
https://gnomecoder.wordpress.com/screenruler/
ScreenRuler
访问该项目在 Launchpad 的主页
屏幕像素尺。
KRuler | by The KDE Community
https://flathub.org/apps/org.kde.kruler
flatpak install flathub org.kde.kruler
flatpak run org.kde.kruler
Screen Ruler | by Bluegrams
官网：https://sf.net/p/screenruler
文档：https://github.com/Bluegrams/ScreenRuler/blob/master/README.md
仓库：https://github.com/Bluegrams/ScreenRuler