There are many ways. I found this article and it has some great ways to promote your website for free.
http://www.rankbetterseo.com/blog/how-can-i-promote-my-website-for-free
Site promotion can absolutely be affordable and easy to do online. One can be sneaky and promote their sites on blogs, or one can directly pay a website for advertising space. The possibilities are endless.
Get articles on your products written by an online writer. The links to your website will be at the bottom of the articles.
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You can find an online center for Computational Fluid Dynamics at the website CFD Online. The website also contains a forum to promote discussion about the latest CFD news.
In these times, online marketing services can be used to promote for everything. They are becoming the major way of advertising and related stuff. Websites can benifit a lot from online marketing services to promote them.
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