Jenkins

Jenkins is an open‑source automation server that lets developers define and run pipelines for building, testing, and deploying software. It can operate as a lightweight continuous‑integration (CI) service or as a full continuous‑delivery (CD) hub, handling the entire lifecycle of a project from source checkout through artifact publication.

The system is packaged as a self‑contained Java program with installers for Windows, Linux, macOS and other Unix‑like platforms, and it is configured through a web interface that provides real‑time validation and help. Its core functionality is extended by a plugin architecture; the Update Center offers hundreds of plugins that connect Jenkins to version‑control systems, build tools, test frameworks, deployment platforms and many other parts of the CI/CD toolchain.

Because plugins are distributed, work can be spread across multiple machines, allowing parallel execution of jobs and scaling to large projects. The project is community‑driven, with contributions ranging from code and documentation to localization and outreach, and it maintains an active bug‑bounty program to improve security.