http://symfony.com/

http://symfony.com/pdf/Symfony_book_2.3.pdf

http://symfony.com/doc/current/reference/index.html

YAML: http://symfony.com/doc/master/components/yaml/yaml_format.html ...1.4

CMF: http://symfony.com/doc/master/cmf/index.html (ContentManagementFramework)

http://knpbundles.com/

twig: http://twig.sensiolabs.org/