Civil Footnotes: A very great plugin for adding footnotes capability to WordPress ((Using a simple markdown-like pattern ala Daring Fireball. Read more about it here.)). It is so good I’ve made some commits to make next version of Opus ((Brace yourself, Opus version 1.2 is coming)) compatible with this plugin ((As you can see on this very post. Neat, right?)).
Hat tip to Austin Sweeney for developing this plugin. A very neat craft.