TeXShop

TeXShop is a free LaTeX and TeX editor and previewer for OS X. It is licensed under the GNU GPL.

It was developed by the American mathematician Richard Koch. TeXShop was modeled on NeXTstep's bundled TeXview.app and developed for the then new OS X user interface Aqua and capitalized on the native PDF support of that version of the Macintosh operating system, which was itself based on NeXTstep's successor OpenStep. Mitsuhiro Shishikura enhanced it by adding the ability to transfer mathematical expressions directly into Keynote presentations. Lacking the TeX eq -> eps Service which TeXview afforded, other apps such as LaTeXiT.app were developed to provide Service support. TeXShop requires an existing TeX installation and is currently bundled with the MacTeX distribution.

The program (then version 1.19) won the 2002 Apple Design Award of Best Mac Open Source Port for its capability to display scientific and technical documents created in TeX format. In fact, TeXShop makes it possible, thanks first to "pdfsync.sty", to switch back and forth between code and preview easily, jumping at a corresponding spot, simply by a CMD-click. From TeXShop 1.35 onward this also works with multipart documents, which are joined by "\include". Also, with version 1.35 TeXShop was extended with XeTeX support.