Script/website: michelf.com/projects/php-markdown/
Requirements: PHP
Installation time: Varies. Wordpress plugin installation takes less than a minute
Difficulty: Easy
License: Free, BSD-style open source
Download: PHP source in zip
API: N/A
Author Description: “The Markdown syntax allows you to write text naturally and format it without using HTML tags. More importantly: in Markdown format, your text stays enjoyable to read for a human being, […]