The OnlyDomains.com is an amazing domain registration tool because you can search domains of all the world at once! This site simplifies the registration process of a lot of countries and you have a support that is really online and can help you at this process.

This tool allows you to find and buy domains at the cheapest price available. The search is super easy. It's also good at reminding you when domains are expiring. The user interface is great, and it gives you a sense that the site is legit (which can be a bit difficult ascertain in this industry)