Well, there has been an overwhelming interest in my last post about Skype being down. So I thought I would do a little research for people into what alternatives there were. Gizmo seems to be the big competitor and is highly regarded. Here is a great article by ZDNet on Skype vs. Gizmo and the comments are equally interesting. Here is a list of some popular voip providers with a little bit about each one. And here is a much more in-depth comparison of Skype to Gizmo called Crowning the King of Free Talk-Skype vs Gizmo. And here is a list from C/Net Download.com of bunch of net phones, sorted by user rating (although it is confusing because the rating and number of users don't seem to match when you go to detail of each - maybe best to sort by editor rating?).
And of course, let's not forget the wikipedia entries for Gizmo Project and Skype and a very comprehensive entry on Comparison of Voip Software (I'd only check out the ones with links, there are a million of them on here).
That is a lot of information, but for even more, you can search on "free internet skype gizmo reviews" and get a ton of information about Skype, Gizmo Project and other VOIP software.
If you are here because Skype is down, I'd check out Gizmo Project. It sounds easy and good and of course, free. And if you are just trying to figure out what to use, these reviews and information should help. At one time I would have said Skype, hands down. I still really like Skype, but I can't say I feel it is the only game in town anymore.
Apologies for the delay, but we can now update you on the Skype sign-on issue. As we continue to work hard at resolving the problem, we wanted to dispel some of the concerns that you may have. The Skype system has not crashed or been victim of a cyber attack. We love our customers too much to let that happen. This problem occurred because of a deficiency in an algorithm within Skype networking software. This controls the interaction between the user’s own Skype client and the rest of the Skype network.
Rest assured that everyone at Skype is working around the clock — from Tallinn to Luxembourg to San Jose — to resume normal service as quickly as possible.
(Updated at 10pm GMT)"