Foundation and Bootstrap are the most popular CSS frameworks nowadays. Both have recently released new versions; Foundation with 6.2 and Bootstrap with 4 (Alpha). The frameworks have a new Grid system using flexbox that can be enabled or disabled at your choice.
A good question between these two frameworks is ‘which one should we use’? It really boils down to what type of project you are working on and how much you enjoy working with each respective framework.
Ink (also called Foundation for Emails) is a HTML email development framework that is built around the best email practices. In the era of smartphones, people are frequently checking their emails on their mobile devices and that means the need for a responsive approach to emails.
Enter Foundation for Emails 2, Ink’s successor. This upgraded framework is mobile-ready and allows developers to quickly create responsive emails that work (even on problematic email software like Outlook). Developed in 2015, this new version focuses on quicker layouts, colors and styles. Foundation for Emails 2 borrows many components, best practices, and workflows from Foundation for Sites. Foundation developers new to HTML emails will feel right at home with this..
Ionic is also a completely free and open-source framework which makes use of AngularJS for creating highly interactive apps. All you need to do is install the node and get started.