A plugin for adding custom buttons to the WordPress HTML Editor, including custom modal dialogs.
I am currently no longer developing or supporting this plugin. I may resume development and support in the future, but I'm not sure when.
Extensible HTML Editor Buttons enhances the WordPress HTML Editor button bar in 5 ways:
It is multi-site compatible.
Enter a post in the wordpress.org support forum for Extensible HTML Editor Buttons, and I'll respond there.