New business looking for solution along the lines of citrix, but not citrix?

Hello Experts,

So I'm working for a client who has a new-ish business.  He was working out of his house, but business picked up so he moved into a storefront.  He currently has one server running Windows Server 2012 r2 datacenter edition which is also running Exchange 2013.  He has six or so computers.  One of them is a desktop running Windows 8.  His other computers are laptops running Windows 7 Home Premium.  He currently uses the program, Xactimate for estimates (one license), Office 365 (five licenses), and Adobe Acrobat (one license).  He wants to get the most out of his software without spending a ton of money.  He wants to have all of his employees connect to a centralized place and be able to use all of the aforementioned software.  This is why I was thinking of Citrix, but he does not want to use Citrix because of the cost involved and because it might be overkill for what he needs.  Since he has the datacenter version of Windows Server, can we do anything with that? Any help, ideas, suggestions would be greatly appreciated.