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BlueCloth is a Ruby implementation of Markdown, a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML).
Texy is one of the most complex lightweight markup language. It allows adding of images, links, nested lists, tables and has full support for typography and CSS. Texy allows you to enter content using an easy to read Texy syntax which is filtered into structurally valid XHTML. No knowledge of HTML is required.
CodeRay is fast syntax highlighter for Ruby and other languages.It produces colorful, valid XHTML.CodeRay's design goal: simple, uncached code highlighting for your board/wiki/blog/doc/website.
A small, but powerful tag-based template language for Ruby similar to the ones used in MovableType and TextPattern. It has tags similar to HTML or XML, but can be used to generate any form of plain text (not just HTML).
Ruby interface to the CRM114 Controllable Regex Mutilator, an advanced and fast text classifier that uses sparse binary polynomial matching with a Bayesian Chain Rule evaluator and a hidden Markov model to categorize data with up to a 99.87% accuracy.
A high-level interface to the CMU Link Grammar. This binding wraps the link-grammar shared library provided by the AbiWord project for their grammar-checker.
Converts text formatted with an exceedingly simple markup language into XHTML - perfect for comments on your blog.
DigestR is a fast rules-based XML processor (similar to the Jakarta Commons Digester) for Ruby, based upon the libxml-ruby Libxml2 binding.