When I started developing the wordpress theme I was worried about where to submit the wordpress theme. I already developed many wordpress plugins but that plugins I submitted to wordpress plugin site. If you are wp theme developer and you want to publish your theme on multiple sites them here is list of URLs where you can submit free wordpress themes.
submit free wordpress themes
After doing googling I found some site where I can submit my wordpress theme and then I can get more traffic for my wordpress themes.
You can submit your wordpress theme to our site. Please send email to our team with theme screenshots and description. You need to send demo URL and download link for your wordpress theme. We will publish your wordpress theme on our showcase page.
You just need send email to our team on firstname.lastname@example.org
My name is Purab Kharat, Here is my Personal Blog: wpapi.com. Work as an Senior Technical Lead at Smartsourcing Global Pvt Ltd in Princeton, NJ, USA. I contributor of many wordpress plugins and Drupal Modules. I am core developer of Drupal. Connect to on LinkedIn or Follow @purab on Twitter or Follow me on Google+ or Write Mail to email@example.com or Chat with me on Skype : purabdk