All official development is by the Kohana Team and tracked on our developer site.
If you want to report a bug or make a features request, use the following links:
If you want to get involved in core development, please submit patches for existing issues. Developers are added to the team by invitation only.
Kohana has a vibrant development community that provide modules to extend and enhance the core framework. If you have a great module that you wish to share with the community, why not put it on Github?