Shared project holds some very useful utility classes that it could be good to have on myfaces commons utils.
The idea is start to move only the classes and methods that are useful, but take care of document them, to finally have a decent api in that field.
Examples of useful classed that should be include are:
org.apache.myfaces.shared.util.ArrayUtils ( concat() function is very useful)
org.apache.myfaces.shared.util.StringUtils (its splitLongString is a very, very useful function)
org.apache.myfaces.shared.renderkit.html.HTML (but instead an interface use a final class)
a subset of RendererUtils and HtmlRendererUtils methods