The 3.1 version of charlieX Screen Rulers for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Theming Tools, more precisely Multiple Desktops.
The actual developer of this Mac application is charlieX software factory. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
CharlieX Screen Ruler is a handy little application that gives you transparent and dragging ruler for your desktop, as well show you mouse arrow coordinates and screen size templates. Useful when you need to measure size or positions of objects on your desktop. Can be helpful for Web and graphic designers, software developers and anyone else who find use for it. It draws transparent pixel-ruler at top and left edge of your desktop.
You may want to check out more Mac applications, such as Onde Rulers, Smart Screen Recorder or Screens VNC - Control your computer remotely, which might be related to charlieX Screen Rulers.
Screen Capture