Livefyre.com is down.
Livefyre was integrated into Adobe's offering.
The product is now called Adobe Experience Manager Livefyre.
Wikipedia points to web.livefyre.com which redirects to the link I provided in the commit.
* [Discourse](http://www.discourse.org)
* [IntenseDebate](http://intensedebate.com/)
-* [Livefyre](http://livefyre.com/)
+* [Livefyre](http://www.adobe.com/marketing-cloud/enterprise-content-management/ugc-content-platform.html)
* [Muut](http://muut.com/)
* [多说](http://duoshuo.com/) ([Duoshuo](http://duoshuo.com/), popular in China)
* [isso](http://posativ.org/isso/) (Self-hosted, Python)