Here I'll post a list of free (sub)domain providers I've used or read of, with a small review.
Domain + DNS
Afraid.org It's my favourite provider. With a free account you can get: - 5 free subdomains from a list of over 90,000 'public' hosts. Public means that you can create subdomains under these domains and use them. Obviously, the owner of the domain has the right to delete domains. - free DNS service. You can add domains you own and set them as 'public' or 'private'. For each domain you can create 20 zone record entries. This service is very nice to be used with .tk .cu.cc or other domains. CONS: a lot of domains are hardly indexed by google Vote: 9,5/10
.tk .cf .ml .ga Freenom is getting important here. 4 TLD free domains, plus free services such as DNS. It's hard to get unnoticed when they have so much. .tk was already famous. .cf and .ml only a little bit less than .tk. The good thing about top level domains is that your sites can achieve very good ranks in search indexes. In the past I had a few problems with .tk domains redirecting to ads, but I hope now this won't happen again. I suppose that they still do that if your sites have very very few visits (maybe less than 1/day). Because you don't pay for these domains, you will not own them, but only have the right to use them for the registered period of time. You can buy them if you want. Vote: 9,5/10
.cu.cc This domain maybe reminds you of .co.cc, which died recently. It is quite similar to .co.cc. You can create a high number (100) of free domains, and use their nameservers, which are very easy to configure. It's quite a nice service. Unfortunately, Facebook doesn't allow me to share .cu.cc links because they are flagged as spam, and this is very annoying, but otherwise it's a very nice provider. Let's hope it won't go down like .co.cc did. CONS: no Ipv6/AAAA records support. Facebook marks cu.cc as spam. Vote: 8,0/10
eu.org One of the first free domain providers. Their website is really old-styled, basic plain HTML. The registration process is automated, but the domain request is not. After requesting the domain, you may have to wait many days before being able to use it. I consider their free domains 4th level subdomains because they won't allow you to register directly under eu.org, but only under one of a list of domains like AT.eu.org LU.eu.org EDU.eu.org You need a DNS server before registering a domain. I've tried requesting a domain and using it with afraid's free dns service. The dns works (servers got response during registration procedure), but, 18 days after my request, the domain hasn't been activated yet. People that have a domain from them are very satisfied with it. The service seems to be very reliable, 100% ads-free. Vote: 6,0-7,5/10
.co.vu - Currently can register upto 2 domains for free. - All DNS changes are instant. option to set up your nameserver setting for your domain. - One click option to configure the domain to popular services like tumblr, posterous, blogger etc.
.co.nr It's URL redirect only, no DNS. It can be very useful either if you don't want configure anything 'difficult' like dns records or your site is hosted not on a VPS, but on another service which already has a domain that you don't like. It's a serious service: no ads, realiable. Vote: 9,0/10
