Jenkins is a community continuation of Hudson, the continuous integration (CI) server (for information on CI see http://www.martinfowler.com/articles/continuousIntegration.html). Written in Java and with a web-based configuration interface, Jenkins can be run standalone (contains its own tiny web server) or in any standard Java-capable web server or application server. But not limited to Java: can test almost anything, particularly projects built with Make, Ant, Maven, or similar.
WWW: https://jenkins.io/
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