EmTeX for PCs running MSDOS or OS/2, MiKTeX and XEmTeX for PCs running Windows and OzTeX for the Macintosh, all come with previewers that can be used on those platforms. EmTeX’s previewer can also be run under Windows 3.1.
Commercial PC TeX packages (see commercial vendors) have good previewers for PCs running Windows, or for Macintoshes.
For Unix systems, there is one ‘canonical’ viewer, xdvi. Xdvik is a version of xdvi using the web2c libraries; it is now built from the same distribution as xdvi. The texlive distributions for Unix systems include a version of xdvik.
Alternatives to previewing include
This answer last edited: 2013-04-11