I have started a new project to add wordpress support to excelent HTML/PHP (and more languages) editor Bluefish (for both unix and windows).
I've got a basic working version. If interested, please visit http://david.binda.cz/turn-bluefish-editor-into-powerful-wordpress-ide
If you would like to join the project, feel free to contact me. Or, if you like the project, please spread the word!