Well Modulus, http://modulus.io, has a number of things that set us apart. One is that we're not really into to tiers. Custom SSL, domains, etc... are part of the normal package. We support WebSockets, there are a couple others that do but most don't. The really interesting piece is that we provide our customers with a great set of statistics about your running application (number of requests, response times, cpu, memory and more). We also have MongoDB hosting in house which lets you spin up a database for your application quickly.