Citrix XenApp is described as 'Product that extends Microsoft Remote Desktop Session Host (formerly known as Terminal Services) desktop sessions and applications to users through the Citrix HDX protocol' and is a Remote Desktop tool in the network & admin category. There are six alternatives to Citrix XenApp for a variety of platforms, including Windows, Linux, Web-based, Android and iPhone apps. The best Citrix XenApp alternative is Cameyo by Google. It's not free, so if you're looking for a free alternative, you could try winflector. Other great apps like Citrix XenApp are Inuvika OVD Enterprise, TSplus, Ericom Connect and Awingu.
Inuvika has a single admin console that is easy to learn and can be managed by admins with less technical skills than Citrix Virtual Apps or VMware Horizon. Great support as well.