Twig
A Symfony project and the current templating engine used by Drupal 8 and later versions.
Blade
The current templating engine used by Laravel 5 and later versions.
Smarty
The current templating engine used by SugarCRM/CivicCRM and can be used with Zend.
Zend View
The templating engine package from Zend.
Handlebars
A JavaScript templating engine.