Great Free Domain Registering Service

cz.cc - Free Domain Registration + Free DNS Service. is one of the best (and free) domain registering service.

Free version services include: register up to 5 domain names, ad-free, and you can also submit your domain(s) to their directory to get more people to visit your website.

If you're willing to pay, then there's the VIPLifetime account, which you can get it with a donation of minimum $9.99. You can register up to 150 free domains (instead of 5), one link will be added to their donation page (= more visitors), it will be indexed on Google, and so on.

If you're looking for free domain registering services, then try this one.