Phonetic or phonological links
of feature matrices at end of textbook ch. 4 (with all known errors corrected), created by Dan McCloy, Bill McNeill, and Steve Moran.
Bruce Hayes' undergraduate phonology
. There you can find, among other things:
(for Word users), for putting brackets around groups of features.
in the textbook
World Phonotactics Database
General phonetic links
(on my LING 450/550 page)