ColourUtility 2.1 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
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. ColourUtility for Mac lies within Design & Photo Tools, more precisely Viewers & Editors. The most popular versions among ColourUtility for Mac users are 1.3 and 1.2. The actual developer of this free Mac application is Theo Howell. The common filename for the program's installer is colourutility.zip.
From the developer:
ColourUtility allows you to convert one type of colour information to another. It can convert between Web/Hex, RGB, Integer and CMYK. In addition it also provides a standard Apple colour picker from where you can pick any arbitrary colour from the colour wheel (or use the magnifying tool to grab a colour from anywhere on your screen) and get it's values.
You may want to check out more Mac applications, such as Vectorworks 2010 Viewer, DropImageURL or Polaris, which might be related to ColourUtility.