Pavel Fedotov released a nice Yii 2.0 template for admin area of a project which is based on genterella theme.
A demo is available at http://gentelella.yiister.ru/.
Paul Klimov released his version of Yii 2.0 project template. It's a bit different in structure from standard ones. There are both admin part and frontend part which are served via different endpoints located in a single web root.
New Yii 2.0 Cookbook article was contributed by @iadj. It was started from discussion on how to run Yii 2.0 on Google AppEngine and explains on how to prepare the application to scale well.
Another good extension by Paul Klimov provides ability to export data to CSV file. It has fully customizable output format, an API similar to GridView which works with data providers, can split data into multiple files and zip results. Extension is unit-tested and has a stable version available.
Official Yii MongoDB extension version 2.0.5 which contains 17 enhancements and bug fixes was released.
One of ex-Yii contributors, Mark Ragazzo writes on immutable objects. What are these, how to impement them properly and why these are helpful. Edited by Alexander Makarov from Yii core team. Recommended for reading.
Philippe Gaultier released an extension that implements Redis-based storage for RBAC hierarchy. Test coverage is very good so it definitely worth trying since Redis is very good for such type of data.
Michael Härtl released a stable version of a package that allows writing data from Query or raw array into Excel files.
We are proud to announce we have released the beta6 version of LUYA, the Yii2 wrapper with a strong CMS and Administration Module. What is new in beta6?
We have fixed so many little bugs and added new features to all modules. We have also moved the LUYA development to a new HQ https://github.com/luyadev to make a real OpenSource organization.
There are also some new modules to help making your website:
Video of CMS Version:
Video of CMS Toolbar: