io.js began with a large concern over the lack of contributors to node.js. Node.js benefits from a vibrant community, but contributions to core repositories have declined, suggesting that the future vitality of the community may be at risk.
The Emergence of io.js
Open Open Source: individuals making significant and valuable contributions are given commit-access to the project to contribute as they see fit. This project is more like an open wiki than a standard guarded open source project.