The 4.5 version of CMacTeX 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. This free Mac app was originally designed by Thomas Kiffe. The program lies within Developer Tools, more precisely IDE. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
CMacTeX is an integrated suite of programs for implementing TeX on Macintosh OS X and Classic OS. It can be configured to work in an integrated fashion with the popular Macintosh editors BBEdit, TextWrangler, and Alpha. It is compatible with the version of TeX found on most Unix systems and is based on the 2008 TeXLive distribution.
You may want to check out more Mac applications, such as JBuddy Bot Builder, HexDecBin or Objective Basic, which might be similar to CMacTeX.