Opencart 3.0 has been released, and represents major changes compared to the 2+ series.

New Opencart 3.0 features:
– Integrated extensions/themes marketplace enabling searching and adding extensions and themes directly in admin.
– Integrated language translations connected to the Crowdin Project in admin.
– Theme editor using Twig for easy design editing via admin.
– Language editor for easy language editing in admin.

Resources:
– Twig
– Crowdin Project
– Opencart
– Opencart Demo
– Download Opencart