Word Processor: LyX
According to the developers: LyX is the first WYSIWYM (What You See Is What You Meant) document processor.
Its not a LaTeX-Editor but a writing program which uses LaTeX as backend, really fast to work with, produces perfect layouts. I'm using nothing else for producing LaTeX-Stuff any more.
http://www.lyx.org/
BibTex Manager: BibDesk
A citation manager with a great interface and seamless OS X integration.
http://bibdesk.sourceforge.net/
Both OSS ofcourse.
Greetings, astifter