I was limited to 3 selections. but wanted to point that documentation for example could be done in two ways: doxygen (for dev) + wiki for centralizing infos and giving more access for infos to users. Wiki can become a growing osx86 head-quarter (as others seemed to fail giving cleaner approach to most needed infos).
Strategic discussion, can olso be done on irc, but time sync is a major handicap.
Bug tracking, as of my understanding could be on trac and/or forum.