You can also look up for these other topics: Framework Coding Standards Boilerplate CMS Tool Security Hacktoberfest
Twig, the flexible, fast, and secure template language for PHP
☕ Latte: the safest & truly intuitive templates for PHP. Engine for those who want the most secure PHP sites.
🔪 A standalone version of Laravel's Blade templating engine for use outside of Laravel.
The standalone version Blade Template Engine without Laravel in a single php file and without dependencies
Template Engine for PHP
Pug template engine for PHP
Elefant, the refreshingly simple PHP CMS and web framework.
PHP Template Attribute Language — template engine for XSS-proof well-formed XHTML and HTML5 pages
Yii 2 Twig extension.
Twital is a "plugin" for Twig that adds some sugar syntax, which makes its templates similar to PHPTal or VueJS.