From Seo Wiki - Search Engine Optimization and Programming Languages
Texy! is a text-to-XHTML formatter and converter library. It allows the user to write structured documents without knowledge or using of HTML language. The user writes documents in easy-to-read plain text format and Texy! converts it to structurally valid and well-formed XHTML code.
It supports very long words division (with respect for language rules), clickable emails and URL (emails are obfuscated against spambots), national typographic single and double quotation marks, ellipses, em dashes, dimension sign, nonbreakable spaces (e.g. in phone numbers), acronyms, arrows and many others.