A simple Google search for ‘web directories’ will result in a lot of directories that openly accept submissions. There is even 1 website listing 20,000 directories where you can submit your site to.
However, since the Penguin Update, you only want to submit to directories that are well moderated and actively managed by their owners. We thus ensure we only submit your site to directories that have passed our proprietary quality guidelines. This ensures a safe link profile that could help boost your SEO efforts.