In the future version of OPN, 2.3 ( or in trunk version if you use our OPN repository), you will have the choice to use a WYSIWYG Editor or use the old system. The OPN developer team has choosen FCKEditor to expand the capabilities of OPN and put this editor in the module structure of OPN.

From the FCKEditor Website:
This HTML text editor brings to the web many of the powerful functionalities of desktop editors like MS Word. It's lightweight and doesn't require any kind of installation on the client computer.
Because it is Open Source, you may use it however you want.

Open Source meets Open Source, thanks to the guys of FCKEditor for their work.