Squid vs Apache Traffic Server: What are the differences?
Developers describe Squid as "A caching proxy for the Web supporting HTTP, HTTPS, FTP, and more". Squid 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. On the other hand, Apache Traffic Server is detailed as "RFC compliant, high performance HTTP proxy cache". It is a fast, scalable and extensible HTTP/1.1 and HTTP/2.0 compliant caching proxy server.Improve your response time, while reducing server load and bandwidth needs by caching and reusing frequently-requested web pages, images, and web ser.
Squid and Apache Traffic Server can be categorized as "Web Cache" tools.
Squid is an open source tool with 607 GitHub stars and 217 GitHub forks. Here's a link to Squid's open source repository on GitHub.