Don't advertise. Be enthusiastic about your product. Have a twitter account? Talk about your product. Start a company/project blog and pimp that content as muc

Don't advertise. Be enthusiastic about your product. Have a twitter account? Talk about your product. Start a company/project blog and pimp that content as much as possible. Email every single blog that covers what your product is about or have influential writers who would like your product. Simply introduce your product in the email and don't ask for a post, link or anything. Ask them for their opinion. This is the best marketing. It's extremely time consuming but I have much more time than I have money, not sure about yourself. You could outsource this but personal emails from the owner/developer will get you further.