Nice list and thank you for sharing. Lately I've most used materializecss and when I came to this page it was the framework I expected to se om the list.
The focus was to highlight CSS frameworks. We generally refer Bootstrap, Foundation, etc as front-end frameworks. I don't see any thing wrong in the title.
@Ida Hansen, In that case it NEEDS to be Mentionned in the title otherwise it's misleading and assumes that for you front-end is just about styling with CSS which is not as there's also content description with HTML and behaviours with JS and PHP.
Amanda Ayers
Nice list! I think that www.ShieldUI.com continues to be one of the most versatile and tested front end framework that I have used.