Jenkins

Jenkins is the most widely used open-source automation server, providing hundreds of plugins to support building, deploying, and automating any project. Originally forked from Hudson, Jenkins has become the industry standard for CI/CD, used by organizations of all sizes. Jenkins supports defining pipelines as code through Jenkinsfiles, enabling version-controlled, reproducible build configurations. Its distributed architecture allows workloads to be spread across multiple agents, scaling to handle large build environments. The plugin ecosystem provides integrations with virtually every tool in the DevOps landscape. While newer CI/CD platforms offer more modern interfaces and cloud-native architectures, Jenkins remains dominant due to its flexibility, extensive plugin ecosystem, and the massive community supporting it.