LyX is a fully featured document processor, including:

http://www.lyx.org/Features

Document formats

• Access to all LaTeX functionality with capability to insert plain LaTeX code anywhere in a document.
• Import LaTeX. Export LaTeX, Postscript, DVI, ASCII, HTML
• Unicode support
• Latex source code viewer
• SGML-tools support (both LinuxDoc and DocBook DTDs?)
• Literate programming support, via the NoWeb? tool.

How to use LyX together with R

by Paul E. Johnson and Gregor Gorjanc

http://wiki.lyx.org/LyX/LyxWithRThroughSweave

Provides an example of how it might be used in Axiom.