LeanDomainSearch is a free domain name registrar provided by WordPress. You can search for a domain by first inputting a keyword. LeanDomainSearch then generates a list of available .com domains with that keyword. When you select a domain, LeanDomainSearch will check to see if the name is available as a Twitter handle, and then guide you to register your domain with Bluehost. LeanDomainSearch is best for companies that use WordPress for their websites.
Your next major concern will be compatibility. It's not a shock that most businesses run on Microsoft Windows and use some form of Microsoft Office. Being able to use common third-party clients such as Microsoft Outlook can often be a concern, and even today, compatibility with Microsoft Outlook isn't necessarily guaranteed. This is especially true when sending and receiving meeting invites. It only takes one garbled meeting invite to realize how frustrating this can be in the real world. Even if using Microsoft Outlook isn't a concern, portability is. If the service is entirely web-based, then is there a means for me to take my email offline and send email when I connect?
BustAName is a free domain generator that stands out by comparing the domain prices among domain registrars like 1&1, NameCheap, and Dreamhost. You can choose from .com, .biz, .net, .org, .info, and .biz extensions and begin your search by inputting multiple keywords at a time, which BustAName will then select from to come up with your list of possible domains. Given its comparison feature, BustAName is best for companies needing the best deal on a domain.