Kohana is an open source, object oriented MVC web framework built using PHP by a team of volunteers that aims to be swift, secure, and small.
Kohana is licensed under a MIT license, so you can legally use it for any kind of open source, commercial, or personal project.
Anything can be extended using the unique filesystem design, little or no configuration is necessary, error handling helps locate the source of errors quickly, and debugging and profiling provide insight into the application.
To help secure your applications, tools for input validation, signed cookies, form and HTML generators are all included. The database layer provides protection against SQL injection. Of course, all official code is carefully written and reviewed for security.
We are working very hard to provide complete documentation. To help improve the guide, please fork the project, make your changes, and send a pull request.
If you are having trouble finding an answer here, search Stack Overflow, followed by asking your question on it. Additionally, you can chat with the community of developers on the freenode #kohana IRC channel.