Exec-PHP
By Soren Weber (http://bluesome.net/)
Why it's awesome: Execute PHP code directly in posts
Why it was picked: Pure power, ultimate customizability
License: GNU General Public License
Manual Install URL: http://wordpress.org/extend/plugins/exec-php/
Automatic Install search term: Exec-PHP
Geek level: WP Ninja
Configuration location: Settings | Exec-PHP
Used in: Posts, pages, text widgets
Note
Exec-PHP should not be used by most common bloggers because it gives too much power to the user. Be warned that running this plugin can be a huge security threat, and should be used only under adult supervision.
Exec-PHP's ability to execute PHP directly into a post, page, or text widget is one of the simpler yet more powerful plugin features available. However, like Peter Parker's uncle said, "With great power comes great responsibility". Exec-PHP should be installed with care and respect.
With this plugin enabled, your website runs a higher security risk, simply because PHP code, which...