Concourse vs PHPCI: What are the differences?
Concourse: Pipeline-based CI system written in Go. Concourse's principles reduce the risk of switching to and from Concourse, by encouraging practices that decouple your project from your CI's little details, and keeping all configuration in declarative files that can be checked into version control; PHPCI: Open source continuous integration tool for PHP. It is a free, open source, continuous integration software written in PHP and designed specifically for PHP projects. Integrates PHPUnit, PHPMD, PHPCPD, PHPCS and more.
Concourse and PHPCI can be categorized as "Continuous Integration" tools.
Concourse and PHPCI are both open source tools. It seems that Concourse with 4.28K GitHub stars and 520 forks on GitHub has more adoption than PHPCI with 2.41K GitHub stars and 493 GitHub forks.