HylaFAX is described as 'enterprise-class system for sending and receiving facsimiles as well as for sending alpha-numeric pages'. There are nine alternatives to HylaFAX for a variety of platforms, including Windows, Linux, Mac, the Web and Android. The best alternative is FaxTalk FaxCenter Pro. It's not free, so if you're looking for a free alternative, you could try HylaFAX+ or ictfax. Other great apps like HylaFAX are ICTBroadcast (Paid), ActFax (Paid), ICTDialer (Free, Open Source) and 4-Sight FAX (Paid).