one of ADDT competitor is Webassist... i think they are your only solution at the moment , webassist.com
But their extention is less less less less superior than ADDT...
Alternatives ? go with joomla !
I agree. I still have CS4 installed because I have 5 sites with ADDT library installed and in use. But I do almost every new site with Joomla. I use DW pretty much to edit CSS and HTML for Joomla sites.