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English:
Based on ‘MaGiKS Proper PHP’, a plugin from Keith James Lock, ‘HG3 Include Codes’ allow you to include any code (html, php, javascript,etc.) directly into the WordPress editor. Syntax near to PHP, you can now precise the path of the file to include using real path, relative path or using a constant. A query (myfile?a=1) and a variable can also be sent to the called file.
Français :
Basé sur ‘MaGiKS Proper PHP’, un plug-in de Keith James Lock, ‘HG3 Include Codes’ permet d’inclure n’importe quel code (html, php, javascript,etc.) directement dans l’éditeur de WordPress. Syntaxe proche de PHP, vous pouvez maintenant préciser le chemin du fichier à inclure avec son chemin réel, relatif ou en utilisant une constante. Un query (myfile?a=1) et une variable peuvent aussi entre passés au fichier à inclure.

HG3-Include

Plugin to include any code (html, php, javascript,...) directly into the WordPress editor.

oltdev

This plugin enables page or post authors to scrape content from mediawiki pages and appending it to their pages. 
It works by scraping content from mediawiki pages by going to a special mediawiki page url.
For example http://en.wikipedia.org/wiki/Wordpress?action=render
The content rendered on the final page or post will always be the newest content, however it is not searchable via regular WordPress search form.
Use case: 
This plugin is great for adding documentation to your site. 
Since wordpress.org is using mediawiki for the codex you could potentially display wordpress codex pages on your site without much effort, just enter the full url of the specific wordpress codex page.
Enjoy

Wiki Append

Append a mediawiki page at the end of the regular wordpress page.

HG3-Include vs Wiki Append