TeXShop 2.30 Release 2/03/2010
(System 10.5 or Higher Strongly Recommended)
(for Systems 10.4, 10.5, 10.6)
TeXShop 1.43 Release 1/22/2006
(for Systems 10.2, 10.3)
Richard Koch
with contributions by Max Horn, Dirk Olmes, Mitsuhiro Shishikura, Seiji Zenitani
Martin Kerz, Isao Sonobe, and Many Others
TeX Live 2009 Release November, 2009
TeX Users Group (TUG) and MacTeX TeXnical working group

TeXShop is distributed under the GPL public license, and thus free.
TeXShop 2.30 requires Mac OS X v. 10.4.3 or later