Factopedia is a multi-lingual free, open database with classified information about different objects around us. Where you can compare objects among each other. This database is created and moderated by the people like you are, we are glad to all new contributers. Everyone can add or edit something, everyone can participate in database creation. The website has free REST API as well. We plan to make it open source in future. We have currently more than 80 000 objects in database. It used PHP, Yii2, MySQL, Sphinx and Memcached.
Yii Version: 2.0