I may mis-understand your question.
Do you mean what languages DH supports? DH supports HTML, PHP, PERL, and CGI. It means you can have .html, or .php files for your website.
If you talk about software, you can use any software to edit your files locally and upload them to server. As long as the files are supported by DH, they will be available to the WWW.
Save $97 (MAX Discount) with code: [color=#CC0000]97YES[/color] [url=http://dreamhost.com/r.cgi?296804/signup|97YES]Sign Up NOW[/url] or More Codes here