What is Semantic UI?
Semantic empowers designers and developers by creating a shared vocabulary for UI.
Semantic UI Screenshots
Semantic UI information
Comments and Reviews
Said about Semantic UI as an alternative
It is a complete web UI framework. It has a lot more widgets than Bootstrap and almost as many as Kendo UI. It is easy to use, feels lightweight and it has a nice default theme.
It has all the bootstrap functionality and more except for carousel