PRIME Mathematics Encyclopedia
Springer Online Reference Works
Science Citation Index Expanded
Directory of Open Access Journals
JLatexEditor (Linux/Unix)
AUTeX (Multi-platforms)
Kile (Linux-KDE, Mac OS X and Windows)
LyX (Linux/Unix, Windows and Mac OS X)
TexMakerX (Linux/Unix, Windows and Mac OS X)
A Comparison of TeX editors (wikipedia)
MiKTeX (Windows)
TeX Live (Linux/Unix and Windows)
MacTeX (MAC OS X)