From https://en.wikipedia.org/wiki/OmniFaces:
OmniFaces is an open source utility library for the JavaServer Faces 2 framework. It was developed using the JSF API, and its aim is to make JSF life easier by providing a set of artifacts meant to improve the functionality of the JSF framework. Omnifaces was created in response to seeing the same questions and the same example and utility code posted over and over again.