10 Best Free and Open Source Continuous Integration Systems

Continuous integration (CI) is the practice of merging all developers’ working copies to a shared mainline several times a day.

Modern application development dictates that multiple developers work simultaneously on different aspects of the same app. If the various code changes are merged on a merge day, the resulting work is often tedious, time-consuming, and manual. The longer development continues on a branch without merging back to the mainline, the greater the risk of multiple integration conflicts and failures when the developer branch is eventually merged back. This is even more likely if each developer uses their own local integrated development environment (IDE) rather than a single cloud-based IDE.

If automated testing discovers a conflict between new and existing code, CI makes it easier to fix those bugs quickly and often.

Successful CI means new code changes to an app are regularly built, tested, and merged to a shared repository.

Here’s our verdict on the finest CI systems. Many of the systems also provide continuous delivery (CD). We only feature free and open source software.

Ratings chart

Let’s explore the 10 CI tools. For each application we have compiled its own portal page, a full description with an in-depth analysis of its features, together with links to relevant resources.

Continuous Integration Tools
JenkinsSelf-contained automation server with an awesome array of plugins
BuildbotPython-based continuous integration testing framework
TektonPowerful and flexible framework for creating CI/CD systems
EarthlyCI/CD framework that runs every pipeline inside containers
DaggerPowerful, programmable CI/CD engine
GoCDEasily model and visualize complex workflows
ConcoursePresents a general approach to automation for CI/CD
WoodpeckerUses docker containers to execute pipeline steps
AgolaCI/CD redefined
LaminarLightweight and modular Continuous Integration service

This article has been revamped in line with our recent announcement.

Best Free and Open Source SoftwareRead our complete collection of recommended free and open source software. Our curated compilation covers all categories of software.

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