TeX does a superior job of formatting complex mathematical expressions. TeX is available in the public domain and from commercial vendors, and can be implemented in a wide variety of computing environments. View and print DVI files created with plain TeX, LaTeX, AMSTeX, or other TeX macros. Tumbleweed Software Download Envoy Viewers and plug-in , free. New and improved GIF replacement format, using lossless compression.
Postscript files are huge, but ready to print.
View or print selected pages. Ghostscript is required. The RTF Specification provides a format for text and graphics interchange that can be used with different output devices, operating environments, and operating systems. The key reason to prefer SGML as the exchange format over industry standards such as PostScript and RTF is that the latter describe merely formatting, not structures that can be presented on display media in a variety of ways. SGML is more powerful because it retains the vital information that describes the document not as a collection of typeset pages but as hierarchy of multi-media elements.