I am currently developing HappyAnalytics, a web application for monitoring search engine traffic (alternative to Google Analytics).
It’s the first web app provided by HappySEOTools. There will be more.
I am using Yii Framework because it provides fast development of web applications and I really enjoy working with it.
You can see some description of the tool at the website and I plan to launch it pretty soon:
PS:
I might be looking for a Yii developer who would like to join me, and also a designer to make the marketing website more attractive so feel free to contact me if you are interested.