Three Dots is a small CSS/CSS3 library that provides a set of 19 fancy animated loading spinners created with three dots.
SpinThatShit is a set of 12+ pure CSS single element loading spinners which can be used to indicate the content loading status in an elegant way.
Yet another CSS loader collection that provides 16 animated loading indicators/spinners based on CSS3 animations and plain HTML structure.
A pure CSS library that recreates the Google loading indicators (loaders, loading spinners) with pure CSS/CSS3.
The material-loading lets you create a fullscreen loading screen for official Material Design Lite framework.