TeXShop 2.18 Release 9/6/2008
(System 10.5 Strongly Recommended)
(for Systems 10.4, 10.5)
TeXShop 1.43 Release 1/22/2006
(for Systems 10.2, 10.3)
Richard Koch, Max Horn, Dirk Olmes
with contributions by Mitsuhiro Shishikura, Seiji Zenitani, Martin Kerz, Isao Sonobe
and Many Others
TeX Live 2008 Release 9/2/2008
TeX Users Group (TUG) and MacTeX TeXnical working group

TeXShop is distributed under the GPL public license, and thus free.
TeXShop 2.18 requires Mac OS X v. 10.4.3 or later
TeXShop