The BootsFaces team have published the source code of the BootsFaces JSF library on GitHub.
BootsFaces is a JSF widget library that translates Bootstrap code to a dialect more familiar to JSF programmers. For instance, a navigation bar is written like so:
Source code and screen shot copied from the Bootstrap documentation.
This converts to the NavBar component familiar from many Bootstrap pages:
BootsFaces offers widgets for the basic tool set of web applications: apart from the NavBar there are menus, panels, buttons, button groups (aka tool bars), input texts, date pickers, modal dialogs, sliders and several more. While the tool set isn't complete yet, the BootsFaces project seems to be very active, so chances are missing components such as check boxes and combo boxes (aka editable drop down menus) are added soon. In any case, it's possible to use a standard JSF check box and use some CSS to align it with the bootstrap look and feel, so this shouldn't be much of a problem.
At first glance, BootsFaces seems to be an interesting framework for everybody who wants to use both Bootstrap and JSF.