If you are developer or theme WordPress theme developer, If you are looking for best WordPress theme Framework. Then the underscore theme framework is the best option. The Automattic community releases its first version on 2015. Now in 2017, it is the most used framework. Around 130 contributors contribute his efforts and time to build the Framework.
Underscore framework has some features,
1- Ultra-minimal CSS
2- Well Commented HTML 5 Tags
4- Actively Maintained
5- Custom Header (using
6- Custom Template (using
7- Mobile Friendly – Dropdown menu on phones/tables
8- WooCommerce Supported.
9- Starter theme
You can download this theme from Github.