EPiServer is described as 'comercial CMS' and is a CMS Tool in the Business & Commerce category. There are more than 100 alternatives to EPiServer, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Windows, Linux and Mac. The best alternative is WordPress, which is both free and Open Source. Other great sites and apps similar to EPiServer are Ghost (Free Personal, Open Source), Drupal (Freemium, Open Source), Grav (Free, Open Source) and Joomla (Free, Open Source).
glFusion is an extremely powerful system for creating online content. It powers all types of sites from personal blogs to high volume community discussion sites, intranets, and almost everything in between. It is well suited for both public and private sites.