FCKeditor – Add WYSIWYG functionality to MediaWiki
I’ve always found it annoying that MediaWiki (the backbone of wikipedia.org) didn’t provide a richer-editor for editing wiki-pages. Sure, I could learn the mediawiki-syntax, but I keep forgetting it. That just means I end up searching Google for a MediaWiki reference guide or keep hitting preview to see what the page looks like.
The FCKeditor-extension adds a much needed WYSIWYG editor. I haven’t always been a fan of the FCKeditor implementation, but this works well.