Maruku is a Markdown interpreter in Ruby. It features native export to HTML and PDF (via Latex). The output is really beautiful!

The core parser for the Bayeux document markup language, optimised for long-form documents. Generators are also provided for HTML, LaTeX and PanDoc

The GEM uses pdftex to combine all JPG files in a directory into a PDF document. It needs a properly installed LaTeX/pdflatex distribution.

Bookmaker provides authors a free, ruby-based production toolchain for self-published paper and electronic books using the LaTeX document preparation system.

Use Branch Raker to maintain a build history for each branch. Originally created for LaTeX projects, but useful for anything that needs to be 'compiled'.

Highly optimized and cached latex server side rendering for Jekyll with macros and dynamic output

http://devel.softeng.ox.ac.uk/trac/softeng/wiki/Utilities/RakeLatex

WTeX converts blended source written both in Wiki and TeX into a valid LaTeX source. Also, binary 'wikitex' will prepare templates & Makefile for making the final PDF.

* A gem that helps you describe latex documents in a ruby environment

This is a gem for generating files/projects using recipes. The default recipes included ruby python and latex files. Erb template supported.

A Ruby gem to create a skeleton for a LaTeX document.

Ruby DSL for LaTeX

This library allows to easily generate LaTeX content (e.g., tables) directly from Ruby.

Image generator for LaTeX/Graphviz source

Jekyll-Quicklatex is a converter plugin for Jekyll. It convert latex code snippet to picture embeded in your page.