Computer robots or "spiders" crawl online content and links.
Many webmasters utilize world wide search engines. Although 90 percent of searches are done by Google, it does not hurt to be in a local or country specific directory. This ie especially advisable if your domain name extension is country specific. ie: .ca .us .uk etc.
Multiple directory submission is advised
to obtain more visitors and/or potential clients
Listed are some links and submission gadgets to help gain exposure for your sites and domain names.
They are listed in no particular order or preference.
Link will open in a new window. Your device must have a browser enabled.
Another tip is create a search engine that can link to your site or pages of your choice.