CodeCows 1.0.12 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. The program lies within Developer Tools, more precisely Webmaster Tools. We recommend checking the downloaded files with any free antivirus. The actual developer of this free Mac application is ZeeZide GmbH.
From the developer:
CodeCows is an Xcode extension that allows you to add hundreds of ASCII cows to your source code. The CowsyEditor extension is context-aware and detects whether you want to use a cow as a string, within a comment or elsewhere. It can insert a random cow, a personalized cow-of-the-day, or one from the list of your favorite cows.
You may want to check out more Mac applications, such as Boks, Navicat for Oracle or SEO PowerSuite Installer, which might be related to CodeCows.