The Jenkins project has an interesting history. It started from scratch in my spare time, and has grown over time to boast 600+ open-source plug-ins developed by 300+ contributors from all around the world.

There are several key ingredients, both technical and social, that enabled this model, and I think those ingredients are useful to other projects. In this talk, I'll discuss how the Jenkins project and the community work, what the ingredients are, why they help you attract more developers into your projects, and why it matters.