Downloading Squid 1.0.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The following versions: 2.5 and 1.0 are the most frequently downloaded ones by the program users. The actual developer of this free software for Mac is Creative Commons Attribution Sharealike. Squid for Mac relates to Design & Photo Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.
You may want to check out more Mac applications, such as Squids, Squid Little or Squeezicks, which might be similar to Squid.