Is Symfony open source?

Related questions

1. What is Drupal architecture?
2. What is RESTful API in PHP?
3. Is Drupal a MVC?
4. Is Symfony free?
5. Is laravel based on Symfony?
6. Which is better CakePHP or laravel?
7. What is Drupal used for?
8. What is Symfony developer?
9. What is the difference between frontend and backend web development?
10. What is a framework in it?

Tags

1. #framework
2. #published
3. #development
4. #frameworks
5. #applications
6. #today
7. #license
8. #symfony
9. #available
10. #under
11. #source
12. #leading
13. #among
14. #developing