Languages from the Americas and Australia are usually written in the Latin alphabet, but often contain characters (e.g. ʉ, ʔ,ɬ/ł,ō) or combinations of characters not found in other language orthographies. So, a keyboard utility which consolidates them in one keyboard layout is very handy.
Chris Harvey of Language Geek.com has a page of keyboard layout downloads (both Windows and Mac). His site also includes keyboard layouts for Cherokee and the languages which use the Aboriginal Syllabics, as well as several freeware fonts covering all these languages. Well worth a visit.